Question Completion Status: QUESTION 4 A sample of prices of skateboards found that the mean price of a skateboard was $67.58 and the standard deviation was 50.018. The data was bellshaped and centered at 67.58. One bootstrap distribution gives a standard error of 10.9. Find the 95% confidence interval. Use 2 for z*. Round your answer to 2 decimal places. Put it in the form to . Answer example 103.23 to 153.68 QUESTION 5 A poll in Canada in 1998 indicated that 48% of Canadians favor imposing the death penalty (Canada does not have it) a report by Amnesty International on this and related polls (www.amnesty.ca) did not report the sample size but stated, "Polls of this size are considered to be accurate within 2.5 percentage points 95% of the time." About how large was the sample size? Round to the nearest person. Use the formula on the bottom of the Chapter 6 formula worksheet. QUESTION 6 We use the t-distribution to calculate a confidence interval for the population mean. If we increase the sample size from 10 to 20 the interval would become smaller because of A. The changes in the degree of freedom B. The change in standard error C. Both "The changes in the degrees of freedom" and "The change in standard error." D. None of the answers mentioned. Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All