Question

A small university is concerned with monitoring its electricity usage in its Student Center. Specifically, its officials want to know if the amount of electricity used differs by day of the week. They collected data for nearly a year, and the relevant summary statistics are provided. Note that electricity usage is measured in kilowatt hours. Based on the ANOVA results, test at the 5% level whether the data provide below is there evidence of a difference in mean electricity use on Sundays and Mondays. Use three decimal places in the test statistic. Day of Week n Mean Sunday 45 86.48 Monday 45 109.29 Tuesday 45 110.96 Wednesday 44 115.03 Thursday 44 114.97 Friday 45 108.58 Saturday 45 87.07 Overall 313 104.56 SD 34.89 27.37 28.64 31.68 33.26 32.22 38.56 34.25

Answer 1

None of the Above are Correct! Ho: Mean Sunday - Mean Monday and Ha: Mean Sunday Not equal Mean Monday;t* = 3.323 p-value = 0.001 (two-tailint-distribution with df - 306, using Statkey) Therefore, there is very strong evidence that electricity use differs significantly on Sundays and Mondays. Ho: Mean Sunday = Mean Monday and Ha: Mean Sunday Not equal Mean Monday;t* = -3.323 p-value = 0.001 (two-tail in t-distribution with df = 306, using Statkey) Therefore, there is very strong evidence that electricity use differs significantly on Sundays and Mondays. Ho: Mean Sunday = Mean Monday and Ha: Mean Sunday Not equal Mean Monday;t* = -3.323 p-value = 0.001 (two-tail in t-distribution with df = 306, using Statkey) Therefore, there isn't very strong evidence that electricity use differs significantly on Sundays and Mondays. Ho: Mean Sunday - Mean Monday and Ha: Mean Sunday Not equal Mean Monday; t = -3.323 p-value = 0.100 (two-tail in t-distribution with df = 306, using Statkey) Therefore, there is very strong evidence that electricity use differs significantly on Sundays and Mondays.