23A pollster wants to find out if citizens are satisfied with the city council. Which procedurewould be most appropriate or obtaining a statistically unbiased sample? *mailing a questionnaire to people whose names have been chosen randomly from a list of costumers in aconvenient store at night.interviewing people at a popular local shopping centerplacing an advertisement in a magazine asking for mail-in responsessurveying people whose names have been randomly chosen from the telephone book.24Which method is most likely to produce a random sample of members of your class? *selecting the first six students to arrive at classchoosing the five oldest students in the classlisting the first six students that come to mindwriting the name of each student on a separate piece of paper then drawing these slips from a hat 25In a recent study, a random sample of 250 trees that had been planted five years ago alongthe Oregon coast showed a significant negative relationship between the distance from theshoreline and the height of the tree. The distance from the shoreline is *a confounding variablean explanatory variablea block design with the distance from the shoreline as the blocka response variable26A college agricultural department wants to test the yields of four different varieties of tomatoplant that it has developed. It also wants to determine how the type of soil in which thetomatoes are grown – sandy or clay – and which of the two fertilizers used will affect yield.How many treatment groups would be required for this experiment? *8126.16O OO O

We have to answer questions on sampling and design of experiment.

Answered: 23 A pollster wants to find out if…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Which of the following are sources of sampling error and which are sources of nonsampling error? Sampling error Nonsampling error Answer Bank The subject lies about past illegal drug use. The subject cannot be contacted in five calls. The telephone directory is used as a sampling frame. Interviewers choose people on the street to interview. Data are gathered by asking people to go to a website and answer questions online. A typing error is made in recording the data.
Suppose you work for a large cell phone distributor, and want to examine which brands of cell phones Canadians prefer around the country. Use the following example dataset regarding the number of users (in millions) based on phone preference and geographical location in Canada. Using this information, and assuming the sample represents the population of Canada perfectly, select all the statements below that are correct. |iPhone AndroidNeither 0.7 0.3 Ontario Quebec British Columbia Other 0.2 0.4 0.4 0.1 0.2 0.3 0.9 0.2 0.4 0.1 P(Ontarid Neither) -0.267 OP(Ontario)and P(British Columbia) are independent events. If a user was known to be from Quebec, the chance of them not using an iPhone is 50%. UP(Other) and P(Android) are not independent events. If a random Android user was selected, there is an approximately 23% chance that they are from British Columbia.
According to the Federal Trade Commission report on consumer fraud and identity theft, 23% of all complaints in 2007 were for identity theft. This year, a certain state kept track of how many of its 1380 complaints were for identity theft. They want to know if the data provide enough evidence to show that this state had a different proportion of identity theft than 23%. State the sample statistic, population parameter, and hypotheses.a) The sample statistic in context is: Select an answer A randomly selected complaint filed with the FTC for that state. The percentage of 1380 randomly selected complaints filed with the FTC for that state that are for identity theft. The percentage of all complaints filed with the FTC for that state that are for identity theft. The mean number of all complaints filed with the FTC for that state that are for identity theft. The mean number of 1380 randomly selected complaints filed with the FTC for that state that are for identity theft. A randomly…
We wish to gather some information relating to the average time a hospitalized Eagle Flu patient remains in the hospital. We randomly sample 16 cured formerly hospitalized Eagle Flu patients and these were the number of days spent in the hospital: 6.09, 8.04, 6.43, 8.58, 10.34, 5.40, 9.87, 9.24, 9.18, 5.06, 5.39, 5.89, 11.91, 8.94, 5.68, 9.85Many surveys of flu hospital stays show that hospitalization length is normally distributed. So, we assume that our sample comes from a normal population with unknown mean of μ days and an unknown standard deviation of σ days. We would like to test whether the average hospital stay length is less than 8.1 days..The null hypothesis is thus H0:μ=8.1 . We will test this against the alternative Ha We want to test at the 8% level.Let x = the sample mean and s = the sample standard deviation.f) Calculate the critical value, tstar, for your test.(negative value)
Suppose you are the president of the student government. You wish to conduct a survey to determine the student body's opinion regarding student services. The administration provides you with a list of the names and phone numbers of 5,412 registered student. Discuss the procedure you would follow to obtain a systematic random sample of 100 students.
The city of Raleigh has 10200 registered voters. There are two candidates for city council in an upcoming election: Brown and Feliz. The day before the election, a telephone poll of 400 randomly selected registered voters was conducted. 197 said they'd vote for Brown, 176 said they'd vote for Feliz, and 27 were undecided.Give the sample statistic for the proportion of voters surveyed who said they'd vote for Brown. Note: The proportion should be a fraction or decimal, not a percent.197400 This sample statistic suggests that we might expect of the 10200 registered voters to vote for Brown.
By a small margin, Facebook remains the top choice of social media over all ages, with 29% using Facebook most often among those using social media sites. However, more visually oriented social networks such as Snapchat and Instagram continue to draw in younger audiences. When asked "Which one social networking brand do you use most often?" the results in the table show the top brands chosen by Americans aged 12-34 who currently use any social networking site or service. Social M edia Site Faceboo k Snapchat Instagra m Twitter Percentage That Use Most Often 29 28 26 6 20 (a) What is the sum of the percentages for these top social media sites? Give your answer as an exact number. Macmillan Learning top social media sites: What percent of Americans aged 12-34 use other social media sites most often? Give your answer as an exact number. other social media sites: do %
Age and party 2008. The Pew Research Centercollected data from national exits polls conducted byNBC News after the 2008 presidential election. Thefollowing table shows information regarding voter ageand party preference: a) What sampling strategy do you think the pollstersused? Explain.b) What percentage of the people surveyed wereDemocrats? c) Do you think this is a good estimate of the percent-age of voters in the United States who are registered Democrats? Why or why not?d) In creating this sample design, what question do youthink the pollsters were trying to answer? Republican Democrat Other Total18–29 260 390 351 100130–44 320 379 300 99945–64 329 369 300 99865+ 361 392 251 1004Total 1270 1530 1202 4002
23. What type of data should be collected to compare the likelihoods of two candidates winning their elections when the candidates are running in different elections? A. Matched-pairs sampling with qualitative data. B. Independent sampling with qualitative data. C. Matched-pairs sampling with quantitative data. D. Independent sampling with quantitative data. 24. A consumer magazine wants to figure out which of two major airlines lost a higher proportion of luggage on international flights. The magazine surveyed Standard Air (population 1) and Down Under airlines (population 2), Standard Air lost 45 out of 600 bags, Down Under airlines lost 30 of 500 bags. Does Standard Air have a higher population proportion of lost bags on international flights? Which of the following is the correct value of the test statistic? A. z -0.9804 B. tio98 = -0.9804 C. z = 0.9804 D. tig98 = 0,9804
28
A survey asked 827 randomly sampled registered voters in California to select a response best fitting their opinion about drilling for oil and natural gas off the coastline of California. Response options include (1) Support, (2) Oppose, or (3) Do not know enough to answer. Data was disaggregated along whether respondents were college graduates or not. Here's the data: Support Drilling Oppose Drilling Doesn't Know Graduated College 154 180 104 Didn't Graduate College 132 126 131 Does this data show a statistically significant difference in the support of drilling between those who graduated college and those who didn't?
Determine whether the sampling method described below appears to be sound or is flawed. In a survey of 337 subjects, each was asked about the importance of the appearance of a job applicant. The survey subjects were human resource professionals who randomly selected by pollsters from a reputable market research firm. It is flawed because it is from a small sample. It appears to be sound because it is a census. It is flawed because it is a voluntary response sample. It appears to be sound because the data are not biased in any way.

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