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 $3,750 with the sample standard deviation of $600. Is there sufficient evidence to reject the null hypothesis using α=0.10? Choose one of the following. -Reject the null hypothesis. There is sufficient evidence at the 0.10 level of significance that the population mean cost is less than $3,927. - Do not reject the null hypothesis. There is insufficient evidence at the 0.10 level of significance that the population mean cost is greater than $3,927. - Reject the null hypothesis. There is sufficient evidence at the 0.10 level of significance that the population mean cost is greater than $3,927.
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
-Reject the null hypothesis. There is sufficient evidence at the 0.10 level of significance that the population mean cost is less than $3,927.
- Do not reject the null hypothesis. There is insufficient evidence at the 0.10 level of significance that the population mean cost is greater than $3,927.
- Reject the null hypothesis. There is sufficient evidence at the 0.10 level of significance that the population mean cost is greater than $3,927.
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