(a) Before Covid the QTI Summer Examinations were invigilated, closed-book exams. The scores on the exams followed a Normal Distribution with a mean of 50 and a standard deviation of 9. It is believed that with the on-line, open book structure the exams are proving easier. (i) Test this using the scores of 35 randomly selected scripts which gave a mean of 55. Use a one-tail test at the 5% significance level.

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