A "classic" statistics problem has students compare the average earnings of electricians and plumbers . There's such a problem in your text. We want to know if the mean income of electricians and plumbers is different. The following sample information is available to you. Mean ($/wk) Std dev ($) Sample Size Electricians 1071.08 15.6 12 Plumbers 1087.42 26.89 12 What are the null and alternative hypotheses to determine if there is a difference? (Don't worry about formatting your answer.)