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A sample of 25 adult elephants had a mean weight of 9500 pounds with a sample...

A sample of 25 adult elephants had a mean weight of 9500 pounds with a sample standard deviation of 150 pounds. The population distribution is normal.

  1. The margin of error for 99% confidence interval calculation is equal to:      a, 61.9 b. 77.3 c. 83.9
  2. The 99% confidence interval for the population mean is equal to:                  a, (9416.1, 9583.9)   b.   (9422.7, 9577.3) c. (8438.1, 9561.9)
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