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quiz 1

# quiz 1 - Question 1 Marks 1 We have discussed that the...

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Question 1 Marks: 1 We have discussed that the standard deviation of the distribution of sample percentages or SE(p hat) is calculated by taking the square root of p hat * (1 - p hat)/ N , where p hat is the proportion in the sample and N is sample size What does SE(p hat) show? Choose one answer. A. It shows the distribution of p hat for the single sample that the researcher draws from the population. B. It shows the standard deviation of the p hat distribution. C. It shows the standard deviation of the P distribution. D. It shows the standard deviation of the Xbar distribution. Correct Marks for this submission: 1/1. Question 2 Marks: 1 Suppose that you want to estimate the 99% CI for the average number of hours that middle school students play video games per month. For a random sample of 100 middle school students, the mean and standard deviation for the number of hours that they play video game per month is 7 and 2 respectivley. What is the best answer? Choose one answer. Correct Marks for this submission: 1/1. Question 3 Marks: 1 Reseaerchers A, B, abd C have each selected a random sample of 300 freshmen from universities A, B, and C and computed the 95% CI for SATQ (SAT quantitative). The universities they sampled from all have around 30,000 students. Researcher A finds the CI to be from 490 to 510. Researcher B finds the CI to be from 610 to 630. Researcher C find the CI to be from 450 to 470. Given that the average of the SATQ in the population is 500, what is the best answer? Choose one answer.

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Correct Marks for this submission: 1/1.
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