Question: Refer t o the data of Exercise 9.60. Is there strong evidence that the standard deviation for the efficiency of the new model is below

Refer t o the data of Exercise 9.60. Is there strong evidence that the standard deviation for the efficiency of the new model is below 3.0?

Data from in Exercise 9.60

Combustion efficiency measurements were recorded for 10 home heating furnaces of a new model. The sample mean and standard deviation were found to be 73.2 and 2.74, respectively. Do these results provide strong evidence that the average efficiency of the new model is higher than 70? (Test at a = .05. Comment also on the P –value.)

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