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1. Test the claim that the mean lifetime of car engines of a particular type is greater than 220,000 miles. Sample data are summarized as n = 23, x = 226,450 miles, and s = 11,500 miles. Use a significance level of α = 0.01. What is the null and alternative hypothesis? What is your final conclusion?

2. The number of standard errors that the sample estimate (p¹ - p²) of (p1 - p2) falls from its null hypothesis value of zero is called:

A) the test statistic.

B) the margin of error.

C) the P-value.

D) the level of significance.

E) None of the above.

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