sample of 20

mean hours of movies watched per month was 80 hrs with 7 hr standard deviation

a. develop a 98% confidence interval for population mean

b. develop a 98% confidence interval for population standard deviation

c. if the sample was 150 households how would you find the confidence intervals for population mean and population sd?

d. increasing the sample size would affect confidence intervals how? would it make interval larger, smaller, same and why?