A random sample of male nontraditional students at a Midwestern University yields the following ages (in years): 52, 68, 22, 35, 30, 56, 39, 48. For this data, the sample mean is 43.75 and s = 15.05. The 99% confidence interval for the mean age of all such students, based upon this data, is approximately 43.75 18.62 43.75 52.66 O 43.75 + 17.85 43.75 t.99 O 43.75 t 13.71

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