1. The mean television viewing time for Americans is 15 hours per week (Money, November2003). Suppose a sample of 60 Americans is taken to further investigate viewing habits.Assume the population standard deviation for weekly viewing time is s 4 hours.
a. What is the probability the sample mean will be within 1 hour of the population mean?
b. What is the probability the sample mean will be within 45 minutes of the populationmean?
2. After deducting grants based on need, the average cost to attend the University of SouthernCalifornia (USC) is $27,175 (U.S. News & World Report, America's Best Colleges,2009 ed.). Assume the population standard deviation is $7400. Suppose that a random sample of 60 USC students will be taken from this population.
a. What is the value of the standard error of the mean?
b. What is the probability that the sample mean will be more than $27,175?
c. What is the probability that the sample mean will be within $1000 of the population mean?
d. How would the probability in part (c) change if the sample size were increased to 100?