Assume That a Simple Random Sample Has Been Selected from a Normally

question 54

Essay

Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic, P-value, critical value(s), and state the final conclusion.
-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 $n = 23 , \bar { x } = 226,450$ miles, and $s = 11,500$ miles. Use a significance level of $\alpha = 0.01$ .