1. A 90% confidence interval for the difference between the proportion of college students who use flash cards for studying and high school students who use flash cards for studying is (0.13, 0.23). Then the Error is 5%. True or False 2. If a 95% confidence interval for the mean was computed as (25,50), then if several more samples were taken with the same sample size, then 95% of them would have a sample mean between 25 and 50. True or False 3. If the standard deviation is increased and the sample size and confidence level stay the same, then the margin of error will also be increased. True or False 4. A Gallup survey based on telephone and face-to-face interviews with 4,220 adults in China, aged 15 and older suggests that 30% smoke regularly or occasionally. The following is also noted "one can say with 95% confidence that the maximum margin of sampling error is 2.5 percentage points". Which of the following is true based on the results of this survey? A: We are 95% confident that 25% to 35% of all Chinese adults smoke. B:We are 95% confident that 27.5 % to 32.5 % of all Chinese adults smoke. C:If we were to randomly sample another group of 4,220 Chinese adults we would find that exactly 30% of them smoke as well. D: Exactly 30% of all Chinese adults smoke. E: If the sample size was larger, the margin of error would be larger as well. 5. Answer the following True or False: If the p-value is 0.13 and the level of significance , , is 0.05 in a hypothesis test for a mean, then we accept the null hypothesis. true false 6. Answer the following True or False: A hypothesis test was used to see if less than 5% of all Americans would still drive to work if gas prices went above $10.00 a gallon. The p-value for this test was 0.03. We can conclude that only 3% of all Americans would still drive to work if gas prices went above $5.00. false true