Each year, all final year students take a mathematics exam. It is hypothesised t

Question

Each year, all final year students take a mathematics exam. It is hypothesised that the population mean score for this test is 100. It is known that the population standard deviation of test scores is 20. A random sample of 26 students take the exam. The mean score for this group is 89. You may find this standard normal table useful throughout the following questions. Calculate the 90% confidence interval for the population mean test score. Give your answers to 2 decimal places. 81.31 lessthanorequalto mu lessthanorequalto 96.69

Explanation / Answer

alpha / 2 = 0.05 Z = 1.64

I: 89 +/- 1.64 *20 / srqt (26)

89 +/- 6.43

82.57 < miu < 95.43

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