30. We wish to see if the dial temperature for a certain model oven is properly calibrated.

30. We wish to see if the dial temperature for a certain model oven is properly calibrated. Four ovens of a certain model are selected at random. The dial on each is set to 300° F and after one hour, the actual temperature of each is measured. The temperatures measured are 305°, 310°, 300°, and 305°. Assuming that the actual temperatures for this model when the dial is set to 300° are normally distributed with mean µ , we test whether the oven is properly calibrated by testing the hypotheses
H 0: µ = 300, H a: µ ≠ 300.
Based on the data, the P -value for this test is
a. between 0.10 and 0.05.
b. between 0.05 and 0.025.
c. between 0.025 and 0.01.

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