1. The problem statement, all variables and given/known data The electricity usage (KWh) in homes was studied over a period of time. For Year 1: Mean = 1130 Std dev. = 196 n = 16 For Year 2: Mean = 1350 Std dev. = 302 n = 21 a) Test the hypothesis that the std dev. in year 2 has increased compared to year 1. Remember to state your significance level. b) Test the hypothesis that the std dev. in year 1 and 2 are equal. Remember to state your significance level. 2. Relevant equations 3. The attempt at a solution I don't know about a) really. For b) I think the F-distribution could be used, right? But what significance level should I use? Someone help me get started on this?