Suppose that the amount of time MMU students spend weekly working as a part timer is normally distributed with a standard deviation of 30 minutes. A lecturer chooses 20 students from Faculty of Management to identify the amount of time spent at part time jobs (in minutes) and the result are listed below. 160 120 130 155 70 110 60 150 180 70 200 220 160 120 80 95 100 120 240 140 (a) Compute the point estimate of the population mean. (b) Compute the 95% margin of error. (c) Construct a 95% confidence interval of the population mean. Interpret the interval.

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