A technician compares repair costs for two types of microwave ovens (type Iand t

Question

A technician compares repair costs for two types of microwave ovens (type Iand type II). He believes that the repair cost for type I ovens is greater than the repair cost for type II ovens. A sample of 56 type I ovens has a mean repair cost of $76.66, with a standard deviation of $18.63. A sample of 75 type Il ovens has a mean repair cost of $72.66, with a standard deviation of $22.09. Conduct a hypothesis test of the technician's claim at the 0.1 level of significance. Let p, be the true mean repair cost for type I ovens and H2 be the true mean repair cost for type lI ovens. Step 3 of 4: Determine the decision rule for rejecting the null hypothesis H, Round the numerical portion of your answer to two decimal places Answer 2 Points Keypad swe Reject Ho if I z I 1.29

Explanation / Answer

NO

your answer Z-test is not correct

Because here population standard deviation is not known.

so we use t-test statistic.

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