A study of the average amount of time a local Oil Pro took to perform an...
A study of the average amount of time a local Oil Pro took to perform an oil change showed that they took an average of 14.8 minutes to complete the service. Suppose you wanted to set up a statistical test to challenge the claim that an oil change at the dealership takes an average of 14.8 minutes.
a. Write the null and alternative hypothesis if you believe the average is more than 14.8 minutes. Draw the curve.
b. Write the null and alternative hypothesis if you believe the average time is different from 14.8 minutes. Draw the curve.
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A study of the average amount of time a local Oil Pro took to
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