(a) A sample of test scores is obtained. The scores are displayed as follows: 11,16,19,15,7,8,10 Test the hypothesis tha
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(a) A sample of test scores is obtained. The scores are displayed as follows: 11,16,19,15,7,8,10 Test the hypothesis tha
(a) A sample of test scores is obtained. The scores are displayed as follows: 11,16,19,15,7,8,10 Test the hypothesis that the mean score is 15 at 1% significance level (10 marks). (b) A chemical manufacturer is concerned about the degree of contamination in the raw material shipments purchased from a supplier. Taking a random sample of 20 shipments of raw materials, the standard deviation of contamination is 3.59. Construct the 95% confidence interval for population variance (10 marks)
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