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Question 391:

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  1. The mean is 32.08
  2. Standard deviation is .6730
  3. The Standard Error of the Mean (SEM) is sd/SQRT(n) = .6730/3.162 = .2128
  4. The critical value from the t-distribution for a 95% CI can be found using Excel =TINV(0.05,9) = 2.262
  5. The margin of error is the critical value * them SEM = 2.262*.2128 =.4813
  6. The 95% CI is the mean minus and plus the margin of error = 32.08 +/- .4813
  7. The 95% Confidence Interval is then (31.95, 32.56)

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