Question 2 [6 marks] A researcher wants to study various characteristics of small retail businesses in Sydney CBD. A random sample of 50 workers who works in small retail businesses reveals the following: Sample average time working per week is 25 hours with a sample standard deviation of 10 hours

a) Construct a 95% confidence interval to estimate the population mean for the time working per week (check assumption). You must use the five steps for hypothesis test. [4 Marks] Solution.

b) Interpret the 95% confident interval. [2 marks]