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Assignment # 2 (Lessons 3- 4)
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 ofand a standard deviation of . Verify the department’s claim that the mean exceeds at .
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