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 in 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 means repair cost was $3,750 with the sample standard deviation of ​$600. Find the test statistic for this hypothesis test. tStat=____   Is there sufficient evidence to reject the null hypothesis using α=0.05​?   A. Do not reject the null hypothesis. There is insufficient evidence at the 0.05 level of significance that the population mean cost is greater than $3,927.   B. Do not reject the null hypothesis. There is insufficient evidence at the 0.05 level of significance that the population means the cost is less than $3,927.   C. Reject the null hypothesis. There is sufficient evidence at the 0.05 level of significance that the population means the cost is less than​$3,927.   D. Reject the null hypothesis. There is sufficient evidence at the 0.05 level of significance that the population means the cost is greater than ​$3,927.   The​ p-value is ___.   What does this​ p-value mean given the results of part​ (a)?     A.The​ p-value is the probability that the actual mean cost is​$3,750 or less.   B. The​ p-value is the probability that the actual mean cost is ​$3,927 or less given the sample mean cost is $3,750.   C. The​ p-value is the probability of getting a sample mean cost of $3,750 or less if the actual mean cost is ​$3,927.   D. The​ p-value is the probability that the actual mean cost is more than ​$3,750.

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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 in 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 means repair cost was $3,750 with the sample standard deviation of ​$600.

Find the test statistic for this hypothesis test.
tStat=____
 
Is there sufficient evidence to reject the null hypothesis using
α=0.05​?
 
A. Do not reject the null hypothesis. There is insufficient evidence at the
0.05 level of significance that the population mean cost is greater than
$3,927.
 
B. Do not reject the null hypothesis. There is insufficient evidence at the 0.05 level of significance that the population means the cost is less than $3,927.
 
C. Reject the null hypothesis. There is sufficient evidence at the 0.05 level of significance that the population means the cost is less than​$3,927.
 
D. Reject the null hypothesis. There is sufficient evidence at the 0.05 level of significance that the population means the cost is greater than ​$3,927.
 
The​ p-value is ___.
 
What does this​ p-value mean given the results of part​ (a)?
 
 
A.The​ p-value is the probability that the actual mean cost is​$3,750 or less.
 
B. The​ p-value is the probability that the actual mean cost is ​$3,927 or less given the sample mean cost is $3,750.
 
C. The​ p-value is the probability of getting a sample mean cost of $3,750 or less if the actual mean cost is ​$3,927.
 
D. The​ p-value is the probability that the actual mean cost is more than
​$3,750.
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