The following information provided below shows the output from the results of performing a confidence interval for a population mean. Answer the following questions:

Confidence Interval:

(233.4, 256.65) 245.025 36.35754604 40 a. Identify the best point estimate of

b. Find the degrees of freedom.

c. Find the critical value that corresponds to n = 40.

The cholesterol levels of 40 women were sampled and a 95% confidence interval estimate was obtained below. The units of measurement for the interval below are

917.562 < < 2254.129

a. Identify the confidence interval. Include the appropriate units of measure.

b. Write statement that correctly interprets the confidence intervale estimate of .

You want to estimate the mean amount of time college students spend on the Internet each month. How many college students must you survey to be 95% confident that your sample mean is within 15 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the Internet is 210 minutes.