Pearson eText Business Statistics: First Course -- Instant Access (Pearson+)
8th Edition
ISBN: 9780136880974
Author: David Levine, David Stephan
Publisher: PEARSON+
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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…
Approximately 50% of all student loans guaranteed by the government are in default.
A random sample of 350 loans to college students in one region of the U.S. indicates
that 147 loans are in default.
a) Do the data indicate that the proportion of student loans in default in this area of
the country differs from the proportion of all student loans in the U.S. that are in
default? Use a = 0.01.
(i) The conclusion for the above problem is
Do not reject the null hypothesis and the proportion of student loans in default
in this area of the country does not differ from the proportion of all student
loans in the U.S. that are in default.
Do not reject the null hypothesis and the proportion of student loans in default
in this area of the country differs from the proportion of all student loans in the
U.S. that are in default.
Reject the null hypothesis and the proportion of student loans in default in this
area of the country differs from the proportion of all student loans in the U.S.
that…
The chief of security for the Mall of the Dakotas directed a study of theft. He selected a sample of 200 boxes that had been tampered with and ascertained that, for 105 of the boxes, the missing pants, shoes, and so on were
attributed to shoplifting. For 40 boxes, employees had stolen the goods, and for the remaining 55 boxes, he blamed poor inventory control. In his report to the mall management, can he say that shoplifting is twice as likely to be
the cause of the loss as compared with either employee theft or poor inventory control and that employee theft and poor inventory control are equally likely? Use the 0.10 significance level.
Hg: The proportions are as stated.
H: The proportions are not as stated.
State the decision rule using 0.10 significance level. (Round your answer to 3 decimal places.)
Reject H0 if chi-square >
4.605
Compute the value of chi-square. (Round your answer to 3 decimal places.)
Chi-square value
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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
- According to the Pew Research Center, the proportion of the American population who use only a cellular telephone (no landline) is 0.37. Jason conducts a survey of thirty 20- to 24-year-olds who live on their own and finds that 16 do not have a landline to their home. Does this provide sufficient evidence to conclude that the proportion of 20- to 24-year-olds who live on their own and don’t have a landline is greater than 0.37? Use an a=0.10 level of significance. Notearrow_forwardThe department of education ran a very comprehensive study in the 1990's to determine the GPA of first generation college students (those who are the first in their family to go to college) in their freshman year. The mean GPA for first generation college students was stated in teh report to be 2.37 for males and 2.21 for females. In 2018, a consumer advocacy group is interested in whether the average GPA for first generation college females was still smaller than their male counterparts. Assume the GPA's are normally distributed. A. State the null hypothesis and the alternative hypothesis. Is the advocacy group interested in a one tail or two tail test (brief explanation)? B. Find the value of the test statistic and an associated p-value (or a range for teh p-value) if 25 males SAR yielded an average GPA 2.46 with a standard deviation of 0.16 and 25 females SAR yeilded an average GPA 2.39 with a standard deviation of 0.12. C. Determine if the test requires use of the Z table or…arrow_forwardImagine that the incidence of gun violence is compared in two cities, one withrelaxed gun laws (A), the other with strict gun laws (B). In the city with relaxedgun laws, there were 50 shootings in a population of 100,000 and in the other city,10 shootings in a population of 100,000. Show contingency table and MedCalcresults. What is the relative risk of gun violence in the city with relaxed gun laws (A)? What is the relative risk of gun violence in the city with strict gun laws (B)? What questions need to be asked before concluding that there is anassociation between shootings and gun laws?arrow_forward
- It was reported that only one job vacancy was available for three recent college graduates. The main reason is that there is an excess of college graduates and a weak national economy. A survey of 100 recent graduates from your college reveals that 60 graduates have found work. At the 0.05 level of significance, can we conclude that the proportion of graduates who have found employment is greater?arrow_forwardIn a particular year in your health jurisdiction, there were 1000 births. In reviewing their birth certificates, you found that 72 had low birthweights (<2500 gms), and 158 had mothers who smoked during pregnancy. Of the mothers who smoked during pregnancy, you found that 19 had low birth weight babies .Show calculations To explore the relationship between maternal smoking and the occurrence of low birth weight, construct the following a 2 x 2 contingency table. What are the relative risks for each of the two sets of mothers? What is the relative risk ratio?arrow_forwardA financial services firm is interested in investigating the cost of exporting a company's products in 4 regions worldwide. The financial analysts collect data of the cost associated with compliance of the economy's customs regulations to export a shipment in 10 countries (in US$) selected from each of 4 regions. They would like to investigate whether the average costs of exporting differ across the four regions. To do so, they first conduct a Levene's test for the homogeneity of the variances across the 4 regions at the 5% level using the absolute deviations from the median. The following Table presents the results. Source of Variation df MS F P-value F crit SS 878417.6 3 292805.8 5.78789 0.00245 2.866 Between Groups Within Groups 1821216.5 36 50589.34 Total 2699634.1 39 What is the appropriate interpretation of the Levene's test? Επιλέξτε ένα: O a. There is sufficient evidence that three population variances are significantly different. O b. There is sufficient evidence that one or…arrow_forward
- 4) Annual expenditures for prescription drugs was $838 per person in the Northeast part of the country. sample of 60 individuals in the Midwest was taken and showed a per person annual expenditure for prescription drugs of $745. Does the sample data support the conclusion that the population annual expenditure for prescription drugs per person is lower in the Midwest than the Northeast.arrow_forwardIn a cohort study of pesticide exposure and cancer, a group of employees who were exposed to the pesticide and a comparative group who were not exposed were followed up for 30 years at a chemical company. Researchers found that the incidence of cancer among the exposed workers was 55.3 per 1,000. In the comparative group, the incidence of cancer was 15.7 per 1,000. Calculate the: 1. relative risk and the 2. attributable risks of exposure of exposure to pesticides and the development of cancer. Please show you calculations. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B I U S Paragraph Arial ≡≡ EE X² X₂ CH H+ {} Ⓒ K + V 10pt >¶¶< +₁ ABC ✔ ✓ E A 11 "" Ω V Tx XQ 田く 52 A&A EXEarrow_forwardHow many females and males of the sample have satisfying non- academic performance inspite of having bad eye vision?arrow_forward
- The recidivism rate for convicted sex offenders is 15%. A warden suspects that this percent is higher if the sex offender is also a drug addict. Of the 377 convicted sex offenders who were also drug addicts, 64 of them became repeat offenders. What can be concluded at the a = 0.01 level of significance?arrow_forwardCash flow and profits are both crucial aspects of a business. Profit is the surplus revenue after deducting business expenses. Cash flow is the total amount of cash moving in and out of your business. For a business to be successful in the long term, it needs to generate profits while also operating with positive cash flow. During the Covid-19 pandemic, however, of a random sample of 199 auditors, 104 indicated some measure of agreement with this statement: cash flow is more important to keep the business operating on a day-to-day basis. a) Investigate the claim that one-half of the members of this population would agree with this statement. Also, find and interpret the p-value of this test. b) Find the probability of accepting the claim with a 10%-level test if, in fact, 60% of all auditors agree that cash flow is an important indicator to keep the business operating on a day-to-day basis.arrow_forwardRecent research indicates that the effectiveness of anti-depressant medication is directly related to the severity of the depression (Khan, Brodhead. Kolts, and Brown, 2005). Based on pre-treatment dcprcssion scores, paticnts werc divlded into four groups based on their level of depi ession. After receiving the antidepression medication, depi ession scores were measured again and the amount of improvement was recorded for cach pcrsion. The following data are similar to the results of the study. Moderately High Moderate Moderate Low Severe Severe 4 5 N= 16 2 3 6 6 G= 48 +a 2 2. 2 6 ΣΧ- 2 4 M=2.5 M=2 M=4 M-5 T= 10 T= 8 T= 16 T=20 SS=. .. SS=2 SS=8 SS- 6 A, Complete the places marking by ... and answer the question whether the data indicate significant difference among the four levels of severity? Test with a= 0.05. B, Compute n', the percentage of variance expressed by group difference.arrow_forward
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