A researcher claims that the average wind speed in a certain city is 8 miles per hour. A sample of 32 days has an average wind speed of 8.2 miles per hour. The standard deviation of the population is...

A researcher claims that the average wind speed in a certain city is 8 miles per hour. A sample of 32 days has an average wind speed of 8.2 miles per hour. The standard deviation of the population is 0.6 mile per hour. At  0.05, is there enough evidence to reject the claim?

STEP 1.
State the null and alternate hypothesis.

STEP 2. The critical value (s) is/are:

z₁ =                         z₂ =

(IF THERE IS ONLY ONE CRITICAL VALUE ENTER IT IN THE LEFT BOX AND ENTER N/A IN THE RIGHT BOX.)

STEP 3.The test-value z₀ is:

z₀
=                                 (Round to two decimal places.)