(hand written)

Question 12 (7 marks) Surveys are regularly conducted to estimate hourly earnings of nonsupervisory employees in various industry groups. Suppose that independent random samples of 14 mine workers and 17 construction workers yield the following statistics: Mining Construction Sample Mean $23.80 $25.40 Sampel Standard deviation $3.25 $3.50 Can we conclude, with a 5% level of significance, that there is a difference between the mean hourly earnings of nonsupervisory mine and construction workers? Assume that the hourly earnings are normally distributed and the population variances are equal