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1. Suppose that the standard deviation is known. A researcher is comparing two shopping center locations...

1. Suppose that the standard deviation is known. A researcher is comparing two shopping center locations (a rural and an urban area) to see if there is an age difference between the customers who shop at the rural location and the customers that shop at the urban location.

?̅̅1̅ = 40 years

?1 = 36 ?

1 = 9

?̅̅2̅ = 35 years

?2 = 49

?2 = 10

a. Draw a standard normal diagram and partition the diagram into regions that represent values of z where the null hypothesis would be rejected and values of z where you do not reject the null hypothesis.

b. Explain what a type I error would mean in this example.

Math   Statistics-And-Probability   
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