Dover Motors is a car dealership that sells new and used cars. Suppose they sold 140 used cars during the most recent quarter. The average selling price was 10,325 with a standard deviation of 2,880.
A random sample of 60 used cars from this population was selected. What is the probability that the sample mean exceeds 10,000?A) 0.5987
B) 0.6736
C) 0.8749
D) 0.9115
Question 2
A survey by American Express Spending reported that the average amount spent on a wedding gift for a close family member is 166. A random sample of 45 people who purchased wedding gifts for a close family member spent an average of 160.50.
Assume that the population standard deviation is 38. Use a 95 confidence interval to test the validity of this report and choose the one statement that is correct.A) Because this confidence interval does not include 166, the report by American Express Spending is not validated.
B) Because this confidence interval does not include 166, the report by American Express Spending is validated.
C) Because this confidence interval does include 166, the report by American Express Spending is validated.
D) Because this confidence interval does include 166, the report by American Express Spending is not validated.
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