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 300F, and after one hour, the actual temperature of each is measured. The temperatures measured are 305, 310, 300, and 305. Assume that the distribution of the actual temperatures for this model when the dial is set to 300 is Normal. To test if the dial is properly calibrated, we will test if the actual (population) mean temperature is something other than 300.

Based on the data, what is the value of the test statistic?

Select one:

a. 1.23

b. 2.45

c. 4.90

d. 5.0