We wish to see if the dial indicating the oven temperature for a certain model oven is properly calibrated. Four ovens of this model are selected at random. The dial on each is set to 300 degree F, and after one hour, the actual temperature of each is measured. The temperatures measured are 305, 310, 300, and 305 degree F. Assuming that the actual temperatures for this model when the dial is set to 300 degree F are normally distributed with mean, µ, we test whether the dial is properly calibrated by testing the hypotheses at 5% of significance level:

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