1)      In a poll 37% of the people polled answered yes to the question are you in favor of the…

1) In a poll 37% of the people polled answered yes to the question are you in favor of the death penalty for a person covited of murder? The margin of error in the poll was 3% and the estimate was made with 96% confidence. At least how many people were surveyed ?

2) By how many times does the sample size have to be increased to decrease the margin of error by a factor of 1/7?

3) People were polled on how many books they read the previous year. Intial survey results indicate that s = 19.1 books

How many subjects are need to estimate the number of book read the previous year with four books with 95% confidence.

4) In a survey of 1017 adults a poll asked are you worried or not worried about having enough money for retirement? Of the 1017 surveyed, 596 stated that they were worried about having enough money. Construct a 95% confidence interval for the proportion of adults who are worried about having enough money to retire.

5) Determine the t value in each of the cases

Find the t value such that the area in the right tail is .10 with 21 degrees of freedom.

6) Determine the point estimate of the population mean and margin of error for the confidence interval.

Lower bound is 22, upper bound is 28.