Question: Q.4.1 Construct a 99% confidence interval for the true proportion of all employees of People Plus Pty who believe that they should be given a

Q.4.1 Construct a 99% confidence interval for the true proportion of all employees of

People Plus Pty who believe that they should be given a raise by the company,

given that 115 out of a sample of 135 employees support this suggestion.

Interpret your answer.(6)

Q.4.2 Construct a 90% confidence interval for the true average monthly salary earned

by all employees of People Plus Pty, if it was found that the average monthly

salary earned by a sample of 16 employees of the company was R17 500, with a

standard deviation of R1 650. Interpret your answer.(7)

Q.4.3 What can we do to make the confidence interval narrower in Q.4.2, without

changing the confidence level?(2)

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