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Question: 03 6612 marks parta426 marks in a random sample of...

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03)- (6+6-12 marks) Part(a)(4+2-6 marks) In a random sample of n 50 families owning television sets in the city of Amman, Jordan, it is found that x 34 subscribe to HBO service. l- Find a 90% confidence interval for the true proportion of families with television sets in this city that subscribe to HBO service 2- ifp is used as an estimate ofp, can we be 90% confident that the error will not exceed 0.04 Part (b (6 marks) The weights, in decagrams, of a sample of 10 packages of grass seed distributed by a Find a 85% confidence interval for the true standard deviation of the weights of all such packages of grass seed distributed by this company. assuming a normal population. pany: yielded a sample mean of 46.12 and a variance of 0.286 .

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