A recent internal report indicated that the mean number of miles between oil cha

Question

A recent internal report indicated that the mean number of miles between oil changes for franchise customers is at least 3,600.

One franchise owner conducted a study to determine whether this statement was accurate for his franchise's customers. He selected a simple random sample of 10

customers and determined the number of miles each had driven the car between oil changes. The sample data that were obtained is listed in the accompanying table.

A.

H0:3,600

HA:<3,600

b. Determine the critical value(s) for 0.10.

The critical value(s) is(are)

(Use a comma to separate answers as needed. Round to four decimal places as needed.)

Explanation / Answer

null hypothesis:H0:3,600

alternative hypothesisHA:<3,600

alpha=0.10

confidence level=1-0.10=0.90

z critical for 90% confidence for left tail is:

-1.645

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