SOLUTION: 39 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 15.3 pounds and a standard deviation of 1.9 pounds. What is the 95 per
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Question 1122656: 39 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 15.3 pounds and a standard deviation of 1.9 pounds. What is the 95 percent confidence interval for the true mean weight, µ, of all packages received by the parcel service?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The 95% half-interval is t0.975, df=38*1.9/sqrt(39)
t=2.02
half-interval is 2.02*1.9/sqrt(39)=0.61
(14.69, 15.91)
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