Answer to Question #137444 in Statistics and Probability for soong

Question

TUTORIAL CHAPTER HYPOTHESIS TEST
Q1 An editor of a publishing company claims that the mean time taken to write a textbook is more than 35 months. A sample of 40 textbook’s authors were selected and found that the mean time taken to write the textbooks was 32 months with a standard deviation of 16 months. Assuming that the time taken to write a textbook is normally distributed, test 5% significant level, is the editor’s claim true?
Q2 The amount of juice extracted from each pineapple is normally distributed with a standard deviation of 3 gram. A random sample of 15 pineapples has a mean amount of juice of 100 gram. Is there evidence to support the claim that the juice of pineapple is more than 120 gram? Use a = 0.05.

Answer 1

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