A report states that the cost of repairing a hybrid vehicle is falling even whil

Question

A report states that the cost of repairing a hybrid vehicle is falling even while typical repairs on conventional vehicles are more expansion. 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 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 month was selected. The sample mean repair cost was $ 3, 780 with the sample standard deviation of $500. Complete parts (a) (b) below H_1: mu

Explanation / Answer

Ha: mean<3927

std error =std deviation/(n)1/2 =50

test stat =(X-mean)/std error =-2.94

critical value =-2.36

reject the null hypothesis...

p value =0.0020

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