1.   A 1% level of confidence is given when ______.
    A. P = 95% B. none of these
    C. P = 99% D. P = 1%
    Hint

  2.   From a population of 32 items, a sample of 25 items is chosen and found to have a standard deviation of 57.0. Find the standard error of the mean.
    A. 10.1 B. 7.25
    C. 11.4 D. 2.28
    Hint

  3.   Use the partial table below. If = 6.4.0, N = 100, and = 37.1, find the interval about the sample mean that has a 1% level of confidence.
   
    A. about 35.45-38.75 B. about 36.04-38.16
    C. about 35.18-39.02 D. about 35.85-38.35
    Hint

  4.   If , , and N = 150, find the interval such that the probability is 90% that the mean of the population lies within that interval. Use the table below to help you.
   
    A. 48.62855.103 B. 50.11453.886
    C. 49.76054.240 D. 49.05154.949
    Hint

  5.   In a sample of 3,000 used cars, the average number of miles each car has been driven was 23,082 with a standard deviation of 4,608 miles. Find an interval of the number of miles about the sample mean that has a 1% level of confidence. Use the table below to help you.
   
    A. 22,91723,246 B. 23,00323,160
    C. 23,03123,132 D. 22,86523,299
    Hint