Use the following information to answer the next six exercises : One hundred eight Americans were surveyed to determine the number of hours they spend watching television each month . It was revealed that they watched an average of 151 hours each month with a standard deviation of 32 hours . Assume that the underlying population distribution is normal 44 . Describe the random variable X in words 45 . Describe the random variable X - bar in words . 46. Which distribution should you use for this problem ? 48. Why would the error bound change if the confidence level were lowered to 95 %