Statistics for Business and Economics (13th Edition)
13th Edition
ISBN: 9780134506593
Author: James T. McClave, P. George Benson, Terry Sincich
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 8.5, Problem 8.67ACB
Vulnerability of relying party Web sites. Refer to the Proceedings of the 5th AMC Workshop on Computers & Communication Security (October 2012) study of the vulnerability of relying party (RP) Web sites, Exercise 8.59 (p. 465). Recall that the Web sites were categorized as server-flow or client-flow Web sites. The researchers want to estimate the true difference between the proportion of server-flow Web sites vulnerable to attack and the corresponding proportion of client-flow Web sites with a 95% confidence interval. They want to know how many Web sites of each type they need to sample to obtain an estimate that is no more than .15 from the true difference.
- a. Identify the parameter of interest for this study.
- b. What is the desired confidence level?
- c. What is the desired sampling error?
- d. Find the
sample size required to obtain the desired estimate. Assume n\ = n2. - e. Repeat part d, but now assume that twice as many Web sites will be sampled from the population of server-flow Web sites as from the population of client-flow Web sites, i.e., assume n1 = 2n2.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
d, e, and f
The article "Prediction of Performance and Evaluation of Flexible Pavement Rehabilitation
Strategies" (K. Lee, K. Wilson, and S. Hassan, Journal of Traffic and Transportation
Engineering, 2017:178–184), describes methods used to rehabilitate Route 165 in the town
of Exeter, Rhode Island. The following table presents monthly counts of two-axle and five-
axle trucks during a recent year. The results are presented in the following table.
Month
Two-axle
Five-axle
Difference
January
1168
1301
-133
February
1466
1495
-29
March
1389
1966
-577
2136
April
May
1691
-445
2116
2015
101
June
2109
2180
-71
2115
July
August
September
2432
317
2523
2064
459
2408
2234
174
October
1899
2144
-245
November
1296
1781
-485
December
1333
1625
-292
Can you conclude that the monthly means differ between the two types of trucks?
The more costly and time-consuming it is to export and import, the more difficult it is for local companies to be competitive and to reach international markets. As part of an initial investigation exploring foreign market entry, 9 countries were selected from each of four global regions. The cost associated with importing a standardized cargo of goods by sea transport in these countries (in US$ per container) is stored in the accompanying data table. Complete parts (a) through (d).
East Asia & Pacific Eastern Europe & Central Asia Latin America & Caribbean Middle East & North Africa240 77 1200 466777 335 688 397266 396 970 554383 83 290 644580 150 545 181220 306 420 646389 1125 450 695233 655 583 754392 100 1500 779
c.
At the 0.05 level of significance, is there evidence of a difference in the variation in cost of importing among the four global regions?
Determine…
Chapter 8 Solutions
Statistics for Business and Economics (13th Edition)
Ch. 8.2 - The purpose of this exercise is to compare the...Ch. 8.2 - Prob. 8.2LMCh. 8.2 - In order to compare the means of two populations,...Ch. 8.2 - Prob. 8.4LMCh. 8.2 - Prob. 8.5LMCh. 8.2 - Prob. 8.6LMCh. 8.2 - Independent random samples from normal populations...Ch. 8.2 - Two independent random samples nave been...Ch. 8.2 - Independent random samples of n1 = 233 and n2 =...Ch. 8.2 - Independent random samples from approximately...
Ch. 8.2 - Independent random samples selected from two...Ch. 8.2 - Lobster trap placement. Refer to the Bulletin of...Ch. 8.2 - Last name and acquisition timing. The speed with...Ch. 8.2 - Shared leadership in airplane crews. Human Factors...Ch. 8.2 - Performance-based logistics. Refer to the Journal...Ch. 8.2 - Drug content assessment. Refer to Exercise 4.123...Ch. 8.2 - Buy-side vs. sell-side analysts earnings...Ch. 8.2 - Homework assistance for accounting students. How...Ch. 8.2 - Comparing taste-test rating protocols....Ch. 8.2 - Producer willingness to supply biomass. The...Ch. 8.2 - Does rudeness really matter in the workplace?...Ch. 8.2 - Prob. 8.22ACICh. 8.2 - Is honey a cough remedy? Refer to the Archives of...Ch. 8.2 - Gender diversity of board of directors. The gender...Ch. 8.2 - Prob. 8.25ACACh. 8.3 - A paired difference experiment produced the...Ch. 8.3 - A paired difference experiment yielded nd pairs of...Ch. 8.3 - The data for a random sample of six paired...Ch. 8.3 - The data for a random sample of 10 paired...Ch. 8.3 - A paired difference experiment yielded the...Ch. 8.3 - Summer weight-loss camp. Camp Jump Start is an...Ch. 8.3 - Performance ratings of government agencies. The...Ch. 8.3 - Twinned drill holes. A traditional method of...Ch. 8.3 - Prob. 8.34ACBCh. 8.3 - I am not selling anything surveys. To improve...Ch. 8.3 - Consumers attitudes toward advertising. The two...Ch. 8.3 - Taking power naps during work breaks. Lack of...Ch. 8.3 - Acidity of mouthwash. Acid has been found to be a...Ch. 8.3 - Solar energy generation along highways. The...Ch. 8.3 - Impact of red light cameras on car crashes. To...Ch. 8.3 - Prob. 8.41ACICh. 8.3 - Alcoholic fermentation in wines. Determining...Ch. 8.4 - Consider making an inference about p1 p2, where...Ch. 8.4 - For each of the following values of , find the...Ch. 8.4 - Prob. 8.45LMCh. 8.4 - Prob. 8.46LMCh. 8.4 - Prob. 8.47LMCh. 8.4 - Prob. 8.48LMCh. 8.4 - The winners curse in auction bidding. In auction...Ch. 8.4 - Prob. 8.50ACBCh. 8.4 - Prob. 8.51ACBCh. 8.4 - Web survey response rates. Response rates to Web...Ch. 8.4 - Hospital administration of malaria patients. One...Ch. 8.4 - Traffic sign maintenance. The Federal Highway...Ch. 8.4 - Salmonella in produce. Salmonella infection is the...Ch. 8.4 - Angioplastys benefits challenged. More than 1...Ch. 8.4 - Entrepreneurial careers of MBA alumni. Are African...Ch. 8.4 - Predicting software defects. Refer to the PROMISE...Ch. 8.4 - Prob. 8.59ACICh. 8.4 - Religious symbolism in TV commercials. Gonzaga...Ch. 8.5 - Assuming that n1 = n2, find the sample sizes...Ch. 8.5 - Find the appropriate values of n1 and n2 (assume...Ch. 8.5 - Suppose you want to estimate the difference...Ch. 8.5 - Enough money has been budgeted to collect...Ch. 8.5 - Last name and acquisition timing. Refer to the...Ch. 8.5 - Homework assistance for accounting students. Refer...Ch. 8.5 - Vulnerability of relying party Web sites. Refer to...Ch. 8.5 - Conducting a political poll. A pollster wants to...Ch. 8.5 - Shared leadership in airplane crews. Refer to the...Ch. 8.5 - Solar energy generation along highways. Refer to...Ch. 8.5 - Angioplastys benefits challenged. Refer to the...Ch. 8.5 - Traffic sign maintenance. Refer to the Journal of...Ch. 8.6 - Use Tables V, VI, VII, and VIII in Appendix D to...Ch. 8.6 - Given v1 and v2, find the following probabilities:...Ch. 8.6 - For each of the following cases, identify the...Ch. 8.6 - For each of the following cases, identify the...Ch. 8.6 - Specify the appropriate rejection region for...Ch. 8.6 - Independent random samples were selected from each...Ch. 8.6 - Independent random samples were selected from each...Ch. 8.6 - Lobster trap placement. Refer to the Bulletin of...Ch. 8.6 - Prob. 8.81ACBCh. 8.6 - Mental health of workers and the unemployed. A...Ch. 8.6 - Drug content assessment Refer to Exercise 8.16 (p....Ch. 8.6 - Last name and acquisition timing. Refer to the...Ch. 8.6 - Prob. 8.85ACICh. 8.6 - Oil content of fried sweet potato chips. Refer to...Ch. 8.6 - Shopping vehicle and judgment. Refer to the...Ch. 8.6 - Is honey a cough remedy? Refer to the Archives of...Ch. 8 - List the assumptions necessary for each of the...Ch. 8 - Two independent random samples were selected from...Ch. 8 - Independent random samples were selected from two...Ch. 8 - Independent random samples were selected from two...Ch. 8 - Two independent random samples are taken from two...Ch. 8 - A random sample of five pairs of observations were...Ch. 8 - Prob. 8.95ACBCh. 8 - Prob. 8.96ACBCh. 8 - Prob. 8.97ACBCh. 8 - Hull failures of oil tankers. Refer to the Marine...Ch. 8 - Effectiveness of teaching software. The U.S....Ch. 8 - Durability of shock absorbers. A manufacturer of...Ch. 8 - NHTSA new car crash tests. Refer to the National...Ch. 8 - Diamonds sold at retail. Refer to the data for 308...Ch. 8 - Childrens recall of TV ads. A study examined...Ch. 8 - Is steak your favorite barbeque food? July is...Ch. 8 - Planning habits survey. American Demographics...Ch. 8 - Turnover rates in the United States and Japan....Ch. 8 - Smartphone usage differs by gender. The role of...Ch. 8 - Life expectancies of working women and housewives....Ch. 8 - Comparing purchasers and nonpurchasers of...Ch. 8 - Prob. 8.110ACICh. 8 - Racial profiling by the LAPD. Racial profiling is...Ch. 8 - State SAT scores. Refer to Exercise 2.27 (p. 60)...Ch. 8 - Rat damage to sugarcane fields. Poisons are used...Ch. 8 - Environmental impact study. Some power plants are...Ch. 8 - Instrument precision. When new instruments are...Ch. 8 - Cooling method for gas turbines. Refer to the...Ch. 8 - Average housing space per person. Even though...Ch. 8 - Positive spillover effects from self-managed work...Ch. 8 - Impact of gender on advertising. How does gender...Ch. 8 - Salaries of postgraduates. Refer to the Economics...Ch. 8 - Gambling in public high schools. With the rapid...Ch. 8 - CareerBank.com annual salary survey....Ch. 8 - Facility layout study. Facility layout and...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.Similar questions
- Many research studies have been conducted to examine how different organizations are on implementing knowledge management processes. For example, studies have proved that larger firms have more resources to utilize, and so they have taken more efforts to implement knowledge management processes. The Journal of Business Research (Aug. 2014) published a study discussing the relationship between knowledge management processes and organizational performance. The table below shows the percentage of different size of firms participated in the study. These firms have been classified in terms of number of employees working. Need step-by-step procedure to answer each question. Randomly select one of the participated company from this study. Let x be the number of employees working in the company. Write the probability distribution of this x. What is the probability that the selected company employs more than 50 employees? Find E(x) and σ. Interpret the result.arrow_forwardA edugen.wileyplus.com WileyPLUS Final Project PLUS Lock, Statistics: Unlocking the Power of Data, 2e Help | System Announcements 4 ВАСК NEXT PRINTER VERSION Chapter P, Section 2, Exercise 062 Identifying Spam Text Messages Bayes' rule can be used to identify and filter spam emails and text messages. This question refers to a large collection of real SMS text messages from participating cellphone users.' In this collection, 747 of the 5574 total messages (13.40%) are identified as spam. The word "free" is contained in 4.75% of all messages, and 3.57% of all messages both contain the word "free" and are marked as spam. The word "text" (or "txt") is contained in 7.01% of all messages, and in 38.55% of all spam messages. Of all spam messages, 17.00% contain both the word "free" and the word "text" (or "txt"). For example, "Congrats!! You are selected to receive a free camera phone, txt ******* to claim your prize." Of all non-spam messages, 0.06% contain both the word "free" and the word…arrow_forward19. Road Patrol. In the paper “Injuries and Risk Factors in a 100-Mile (161-km) Infantry Road March" (Preventative Medicine, Vol. 28, pp. 167–173), K. Reynolds et al. reported on a study com- missioned by the U.S. Army. The purpose of the study was to im- prove medical planning and identify risk factors during multiple-day road patrols by examining the acute effects of long-distance marches by light-infantry soldiers. Each soldier carried a standard U.S. Army rucksack, Meal-Ready-to-Eat packages, and other field equipment. A sample of 10 participating soldiers revealed the following data on total load mass, in kilograms. 48 50 45 49 44 47 37 54 40 43 a. Obtain the sample mean of these 10 load masses. b. Obtain the range of the load masses. c. Obtain the sample standard deviation of the load masses.arrow_forward
- 2. An experiment was conducted to measure the effect of popcorn brand as well as the type of popcorn maker/popper and their interactions on the yield (in cups of popper popcorn from 4 cup of popcorn). The types of poppers used in the tests were Oil-based versus Air-based. And, the popcorn brands were Gourmet, National, and Generic Brand. The obtained data are as follows. Do type of popcorn maker and popcorn brand and their interactions significantly impact popcorn yield at 5% significance level? Brand Row mean Роpper Gourmet National Generic Oil-based 5.5 4.5 3.5 5.5 4.5 4 6 4 3 mean 17/3 13/3 10.5/3 4.5 Air-based 6.5 5 4 7 5.5 5 5 4.5 mean 20.5/3 15.5/3 13.5/3 5.5 Column Mean 6.25 4.75 4 Overall = 5arrow_forward2. A study was performed among patients with a rotator cuff shoulder injury. Patients were randomized to receive either a specific yoga maneuver (called the active group), or a sham yoga maneuver (called the sham group). Patients were asked to rate their pain on a 10-point Likert scale with a higher number indicating more pain. They evaluated their pain at baseline (time 1). They were then taught to perform either the active maneuver or the sham maneuver and rated their pain 1 hour later (time 2). Pain was assessed for 2 specific types of shoulder movement referred to as abduction (roughly meaning moving their shoulder away from their body) and flexion (roughly meaning moving their shoulder inward towards their mid-chest). The results for change in pain between Time 2 and Time 1 for the abduction maneuver are given in Table 3 for the subgroup of patients with rotator cuff symptoms in their dominant arm. Table 3 Change in Pain (Time 2 minus Time 1) for Subjects in the Rotator Cuff…arrow_forwardRead the scenario below to determine which one of the threats to external validity (interaction between treatment and selection, interaction between treatment and location or interaction between treatment and history [time]) is of most concern. During the academic school year of 2019-2020 researchers completed a study on the impact of early childhood education on the social development of children. The researchers selected programs in one county with plans to generalize the findings to the entire state. A. Interaction of treatment and selection B. Interaction of treatment and location C. Interaction of treatment and historyarrow_forward
- The Internet is rapidly becoming an essential source of information about health, nutrition, finances, and current events. Neunschwander, Abbott, and Mobley (2012) were interested in inequality of access to the Internet as a function of the characteristics of the participant. They recruited a very large sample of participants from the Indiana Supplemental Nutrition Assistance Program and surveyed them about their access to the technology. They observed that racial minorities, older persons, and persons with lower educational attainment were less likely to have a functioning computer at home and, relatedly, were less likely to have access to the Internet. Below are frequencies similar to those observed by the researchers. Owns a Computer Does Not Own a Computer Age: 18-30 378 336 Age: 71 and Older 23 127 Does the proportion of participants who own a computer differ significantly from group to group? Test with alpha = .05. Compute Cramer’s V to measure…arrow_forwardNana AB. supplies a range of computer hardware and software to 2000 schools within a large municipal region of Spain. When Nana AB. won the contract the issue of customer service was considered to be central to the company being successful at the final bidding stage. The company has now requested that its customer service director creates a series of graphical representations of the data to illustrate customer satisfaction with the service. The following data has been collected during the last six months and measures the time to respond to the received complaint (days).52434661563832 87783496745423 5632861281325253 3445213142125321 437662127336712 7889261074782332 2621567891851512 1556452145262134 2812672324432565 238872178547679 The customer service director has analysed this data to create a grouped frequency table and plotted the histogram. From this he made a series of observations regarding the time to respond to customer complaints. He now wishes to extend the analysis to use…arrow_forwardCHI SQUARE QUESTION Research has demonstrated strong gender differences in teenagers’ approaches to dealing with mental health issues (Chandra & Minkovitz, 2006). In a typical study, eighth-grade students are asked to report their willingness to use mental health services in the event they were experiencing emotional or other mental health problems. Typical data for a sample of n = 150 students are shown in Table 17.8. Do the data show a significant relationship between gender and willingness to seek mental health assistance? Note: This is an example for a Chi-Square Test for Independence. Probably No Maybe Probably Yes Males 17 32 11 60 Females 13 43 34 90 30 75 45 n = 150 Demonstrate the 4 steps of hypothesis testing, with an alpha level of .05. In addition, provide a table with expected frequencies. The expected frequencies must maintain the same row totals and column totals, and create an ideal frequency…arrow_forward
- An article23 summarized results from the Nurses’ Health Study and the Health Pro- fessionals Follow-Up Study. The article reported (with RR = relative risk) that “Com- pared with nonregular use, regular aspirin use was associated with lower risk of overall cancer (RR 0.97; 95% CI 0.94, 0.99), which was primarily due to a lower incidence of gastrointestinal cancers, especially colorectal cancers (RR 0.81; 95% CI 0.75, 0.88).” Identify the response variables and the explanatory variable for these two results. Explain how to interpret the confidence interval about colorectal cancers. Would the association with overall cancer be considered (i) significant or non- significant? (ii) strong or weak? Explain. question 1 and 2arrow_forwardA developmental psychologist interested in the attachment between full-term and pre-term infants and their mothers conducted a study to measure infant willingness to explore a strange environment by counting the number of toys infants handled during a five minute interval. Four groups of infants, two comprised of full-term infants and two of per-term infants, were observed both when their mothers were present and when their mothers were absent. The data is presented in the table that follows: Baby Birth Condition | Mother 1 # of Toys (toys) Identify one of the independent variables: Full-term Present Present 2 Full-term 6. 3 Full-term Present Present Full-term Full-term Full-term Full-term Full-term 4 5 Absent 6. 6. Absent 4 Absent 5 Absent Identify the other independent variable: 7 4 9. Pre-term Present 6. 10 Pre-term Present 7 11 Pre-term Present 5 12 Pre-term Present 4 Identify the dependent variable: 13 Pre-term Absent 3 14 Pre-term Pre-term Pre-term Absent 4 15 Absent 4 16 Absent…arrow_forwardA cohort study was undertaken to test for association between arteriolosclerosis (hardening of the arterioles) and secondary hypertension. The data were split into 2 groups: subjects who had been treated with nonsteroidal anti-inflammatory drugs (NSAIDS) and those who had not. The stratified data are shown in Table 3: Treated with NSAIDS Exposure Category Secondary Hypertension No Secondary Hypertension Total Not Treated with NSAIDS Exposure Category Secondary Hypertension No Secondary Hypertension Total Table 3 Arteriolosclerosis 46 23 69 Arteriolosclerosis 79 25 104 No Arteriolosclerosis 251 724 975 No Arteriolosclerosis 405 446 851 Total 297 747 1044 Total 484 471 955 Obtain the stratum-specific odds ratios for the 2 groups and the odds ratio for the aggregate data. Comment on the association between arteriolosclerosis and secondary hypertension and the role played by NSAIDS in this association.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill
Big Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt
Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL
Glencoe Algebra 1, Student Edition, 9780079039897...
Algebra
ISBN:9780079039897
Author:Carter
Publisher:McGraw Hill
Big Ideas Math A Bridge To Success Algebra 1: Stu...
Algebra
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:Houghton Mifflin Harcourt
Holt Mcdougal Larson Pre-algebra: Student Edition...
Algebra
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
what is Research Design, Research Design Types, and Research Design Methods; Author: Educational Hub;https://www.youtube.com/watch?v=LpmGSioXxdo;License: Standard YouTube License, CC-BY