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13. (10 pts) An automobile service station times the Quick Lube service for a random sample of 22 customers. The sample standard deviation of times was s = 7.2 minutes, The service manager specifies that a be 6 minutes. Does the sample data indicate that o is different from 67 Use a 1% level of significance. a. State the null and alternate hypotheses. b. Identify the appropriate sampling distribution: Chi-square test of independence, Chi-square goodness of fit, or Chi-square for testing or estimating of or G. What is the value of the sample test statistic? c. Find or estimate the P-value UST 12