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A discount airline allows staff 37.00 minutes between flights to clean the aircraft interior. The aircraft workers union claims that the average time that it takes to this cleaning is more than 37.00 minutes. They take a random sample n = 12 flights and time how long it takes to carry out the cleaning. They find that the sample mean is 37.11 minutes and the sample standard deviation is 5.01 minutes.

(i) Select the null and alternative hypotheses for the test.

(ii) Which of the following formulas would you use to calculate the test statistic?