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·Secure : https //www mathxl 4640955118questionid-S&flushed-faiseacld-48286028; ichael mecabe 3,1,18 8:24 PM BUS 352 TR700 Spring 2018 Homework: Chapter 9 Homework Score: 0.11 of 1 pt 9.3.47-T Save 5 of 6 (6 complete) Hw Score: 63.76%, 3.83 of 6 pts Question Help are getting more expensive. The most common A report states that the cost of repairing a hybrid vehicle is faling even while typical repairs on convent hybnd regar replacrg the hybrid nerier assembly had a moan repar cost of $3.927 n 2012 Indary esperts suspect that the cost w·cotrue to dee nase ger, te increase in the number of technicians who have gained expertise on fixing gas-electric engines in recent moniths Suppose a sample of 100 tybrid inverter assembly repairs completed in the last month was selected. The sample mean repair cost was $3,850 with the sample standard deviation of $500 Complete parts (a) and(b a. Is there evidence that the population mean cost is loss than $3,927? (Use a 0.10 level of significance.) State the nul and altermative hypotheses Type integers or decimais) Enter your answer in the edit fields and then click Check Answer Clear All

Explanation / Answer

Using Minitab:

One-Sample T

Test of null = 3927 vsAlternative <= 3927

N Mean StDev SE Mean 90% Upper Bound T-value P-value   
100 3850.0 500.0 50.0 3914.5 -1.54 0.063

P-value 0.063 is less than 0.1 so we reject the null hypothesis.

Hope this will be helpful. Thabks and God Bless you :-)

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