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Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Find a 90% confidence interval estimate for the population mean delivery time.

Sagot :

Answer:

90% confidence interval = (34.069,37.931)  

Step-by-step explanation:

90% 1.645

 Xbar / Point Est. 36

 µ 0

σ 6

n 28

Confidence Interval  

 (34.069,37.931)  

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