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Question 1: (Marks: 7)
A sample of 15 measurements of the breaking strength of iron pipes gave a mean grams and a standard deviation s =35 grams. Find 99% confidence interval for the actual mean breaking strength.

Question 2: (Marks: 8)
A random sample of 100 workers with children in day care, show a mean day-care cost of Rs.2750 and a standard deviation of Rs.500. Verify the departmentís claim that the mean exceeds Rs.2600 at .