15) What are the reasons for sampling rather than population? a) Saving time b) Saving money c) Impossible to check all the members of the population d) All of the above
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- O In a certain survey, 509 people chose to respond to this question: "Should passwords be replaced with biometric security (fingerprints, etc)?" Among the respondents, 55% said "yes." We want to test the claim that more than half of the population believes that passwords should be replaced with biometric security. Complete parts (a) through (d) below. a. Are any of the three requirements violated? Can a test about a population proportion using the normal approximation method be used? OA. The conditions np 25 and nq 25 are not satisfied, so a test about a population proportion using the normal approximation method cannot be used. OB. All of the conditions for testing a claim about a population proportion using the normal approximation method are satisfied, so the method can be used. OC. The sample observations are not a random sample, so a test about a population proportion using the normal approximating method cannot be used. OD. One of the conditions for a binomial distribution are…6. In order to take a sample of 1200 people from a population, I first divide the population into men and women, and then take a simple random sample of 500 men and a separate simple random sample of 700 women. This is an example of A) block design. B) stratified random sample. C) double blind simple random sample. D) an experiment. E) A and D F) B and C G) A and BA market research firm has carried out an observational study on the chief executives from a random selection of the law firms in the country. The numerical measures obtained from the analysis of the data are referred to as ______? a) records b) statistics c) parameters d) variables
- 18)A) minor mode b) major mode c) median d) meanb) A certain pay television company wishes to estimate the proportion of its customers who would purchase a pay television program guide. To do this, the company manager decides to select a random sample of customers and note the number who would purchase a program guide. Suppose that experience in other areas suggests that about 13% of customers will purchase a program guide. How many customers should the company manager include in his sample if he wishes to estimate the true proportion who will purchase the program guide correct to within 5% (0.05) with a confidence level of 95%?
- 1) population 2) sample 3) dataAs part of a statistics project, a teacher brings a bag of marbles containing 700 white marbles and 300 red marbles. She asks her students to determine how many red marbles are in the bag without counting them.A student randomly draws 100 marbles from the bag. Of the 100 marbles, 28 are red.A)The target population consists of The 300 red marbles in the bag The 28 red marbles drawn by the student The 1000 marbles in the bag The 100 marbles drawn by the student None of the above B) The sample consists of The 100 marbles drawn by the student The 28 red marbles drawn by the student The 300 red marbles in the bag The 1000 marbles in the bag None of the above C) Based on the sample, the student would estimate that _____ marbles in the bag were red.-n list on 22 cion 23 -tion 24 stion 25 stion 26 estion 27 estion 28 estion 29 K You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 1.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. n=0 (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 37% of air passengers prefer an aisle seat. n= (Round up to the nearest integer.)
- The difference between the sample and the actual target audience is due to what we call? a) Random Sampling Error b) Chance Variation c) Systematic Error d) Measurement Error e) Answers A and B are correct f) Answers C and D are correctSuppose on a sample of Montanans it is found the mean salary is equal to 30,000. When we use a statistic like this to simply describe a sample, this is an example of: a) an inferential statistic b) a descriptive statistic c) a sample median d) random sampling e) b and c8.
