Question

Suppose we are doing a study on the proportion of people who have texted while driving. We will use a 90% confidence interval. We need to know what sample size to use before we do the study. What sample size should we use to guarantee that our MOE is 3% or smaller? Round your answer up to the nearest whole number. Group of answer choices 752

Question 2 Suppose we are doing a study on the proportion of people who have texted while driving. But this time we want to be more accurate, so we use a 99% confidence interval. We need to know what sample size to use before we do the study. What sample size should we use to guarantee that our MOE is 3% or smaller? Round your answer up to the nearest whole number. Note: Your answer should be much larger than the previous answer. Hypothesis Test Example For Proportions: What proportion of people do not drink alcohol? You believe that the proportion of people in the U.S.A. who do not drink is less than 15%. To determine if you are correct, you take a SRS of 400 U.S. residents, and find the proportion of people who do not drink in your sample is 0.22. Conduct a hypothesis test at the 5% significance level.

Question 3 Write the hypotheses for the test.

Question 4 Check the assumptions for the test. There are two assumptions you must test.

Question 5 What is the z-crit value? Round your answer to 2 decimal places. Include the correct sign.

Question 6 Calculate the value of the test statistic z-calc. Round your answer to 2 decimal places.

Question 7 Do you reject or fail to reject the null? Reject Ho Fail to Reject Ho

Question 8 Write the conclusion. State the significance level in the conclusion.

Question 9 Increasing sample size while holding the confidence level constant will increase the width of the confidence interval. True False

Question 10 Increasing the confidence level while holding the sample size constant will increase the width of a confidence interval. True False

Answer 1