Question;PSTAT 109: Quiz 9;Winter 2014;Instructions: Please show all formulas and calculations in an organized fashion for full credit.;Problem 1.Because of the expense involved, car crash tests often use small samples. When;ve BMW cars are crashed under standard conditions, the average repair costs (in dollars);is $1159.40 with a standard deviation of $284.73. Assuming BMW repair costs are approx-;imately normally distributed, use a 0.05 signicance level to test the validity of the claim;that the mean repair costs for all BMW cars is less than $1000. Would BMW be justied in;advertising that under the standard conditions, the repair costs are less than $1000?
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