# Question: View the 989 donors in the donations database out of

View the 989 donors in the donations database (out of 20,000 people represented on the companion site) as a random sample from a much larger population of people who would make a donation in response to the mailing. Note that the column of 989 donation amounts has been named “donation_D1.”

a. Find the 95% confidence interval for the population mean donation amount.

b. Find the 99% confidence interval for the population mean donation amount.

a. Find the 95% confidence interval for the population mean donation amount.

b. Find the 99% confidence interval for the population mean donation amount.

## Answer to relevant Questions

View the 20,000 people represented in the donations database (on the companion site) as a sample from a much larger population. Of these 20,000 people, 989 made a donation in response to the current mailing. a. Find the 95% ...A nationwide poll claims that the margin of error is no more than 4.3 percentage points for questions asked of half the sample. a. Verify this claim in a particular case by computing the t table value times the standard ...A sample of 93 coils of sheet steel showed that the average length was 101.37 meters, with a standard deviation of 2.67 meters. a. Interpret the standard deviation in words; in particular, what is it measuring the ...Intensities have been measured for eight flashlights. Find the appropriate t value from the t table to use for each of the following confidence interval calculations: a. Two-sided 95% confidence. b. Two-sided 99% ...Now look at the entire population of salaries, which you can’t usually do in real life. a. Find the population mean and standard deviation, and compare them to the sample estimates from the previous problem. b. Draw a ...Post your question