Instructor-created question = Question Help Course Note Packet Chapter 9 Page 7,9 and 10 A report states that the cost of repairing a hybrid vehicle is falling even while typical repairs on...

Extracted text: Instructor-created question = Question Help Course Note Packet Chapter 9 Page 7,9 and 10 A report states that the cost of repairing a hybrid vehicle is falling even while typical repairs on conventional vehicles are getting more expensive. The most common hybrid repair, replacing the hybrid inverter assembly, had a mean repair cost of $3,927 in 2012. Industry experts suspect that the cost will continue to decrease given the increase in the number of technicians who have gained expertise on fixing gas-electric engines in recent months. Suppose a sample of 100 hybrid inverter assembly repairs completed in the last month was selected. The sample mean repair cost was $3,870 with the sample standard deviation of $400. Complete parts (a) and (b) below. a. Is there evidence that the population mean cost is less than $3,927? (Use a 0.01 level of significance.) State the null and alternative hypotheses. H,: s (Type integers or decimals.) Find the test statistic for this hypothesis test. tSTAT = |(Round to two decimal places as needed.) The critical value(s) for the test statistic is(are)|- (Round to two decimal places as needed. Use a comma to separate answers as needed.) Is there sufficient evidence to reject the null hypothesis using a = 0.01? O A. Do not reject the null hypothesis. There is insufficient evidence at the 0.01 level O B. Reject the null hypothesis. There is sufficient evidence at the 0.01 level of significance that the population mean cost is less than $3,927. i significance that the population mean cost is less than S3,927. O C. Do not reject the null hypothesis. There is insufficient evidence at the 0.01 level of significance that the population mean cost is greater than $3,927. O D. Reject the null hypothesis. There is sufficient evidence at the 0.01 level of significance that the population mean cost is greater than S3,927. b. Determine the p-value and interpret meaning The p-value is (Round to three decimal places as needed.) What does this p-value mean given the results of part (a)? O A. The p-value is the probability of getting a sample mean cost of $3,870 or less if the actual mean cost is $3,927. O B. The p-value is the probability that the actual mean cost is S3,927 or less given the sample mean cost is $3,870. O C. The p-value is the probability that the actual mean cost is S3,870 or less. O D. The p-value is the probability that the actual mean cost is more than $3,870.