(e) What is the percentage of raw variability in electricity consumption that is explained by mean temperature? (f) Use R2 to calculate the value of r by hand. (g) Give and interpret a 98% confidence interval for o. (h) Give and interpret a 90% confidence interval for Bi. (i) Give and interpret a 90% interval for the average electrify consumption for days that are 79 degrees Fahrenheit. (1) Tomorrow it is supposed to be an average of 67 degrees Fahrenheit in College Station, TX. Predict tomorrow's electricity consumption using a 90% interval. (k) Run an appropriate hypothesis test to determine if there is statistically significant evidence that the average electricity consumption changes with the mean daily temperature. Table 7.20 Data for Exercise 7: Heating Costs Kwh Mo Day Tavg Kwh Tavg Day Mo 10 10 19 20 21 22 23 24 45 73 43 61 52 56 10 10 10 10 10 70 25 10 26 27 28 29 30 9 9 9 9 9 9 9 9 9 10 10 10 10 10 10 10 10 10 10 10 10 77.5 80.0 78.0 78.5 77.5 83.0 83.5 81.5 75.5 69.5 70.0 73.5 77.5 79.0 80.0 79.0 76.0 76.0 75.5 79.5 78.5 82.0 71.5 70.0 69 53 51 39 55 55 57 68 73 57 51 55 56 72 73 69 38 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4. 10 10 10 10 10 10 10 10 10 10 10 11 68.0 66.5 69.0 70.5 63.0 64.0 64.5 65.0 66.5 67.0 66.5 67.5 75.0 75.5 71.5 63.0 60.0 64.0 62.5 63.5 73.5 68.0 77.5 2 3 4 50 37 43 42 25 31 31 32 35 32 34 35 41 51 34 19 19 30 23 35 29 55 56 5 6 7 8 9 10 11 12 11 11 11 (e) What is the percentage of raw variability in electricity consumption that is explained by mean temperature? (f) Use R2 to calculate the value of r by hand. (g) Give and interpret a 98% confidence interval for o. (h) Give and interpret a 90% confidence interval for Bi. (i) Give and interpret a 90% interval for the average electrify consumption for days that are 79 degrees Fahrenheit. (1) Tomorrow it is supposed to be an average of 67 degrees Fahrenheit in College Station, TX. Predict tomorrow's electricity consumption using a 90% interval. (k) Run an appropriate hypothesis test to determine if there is statistically significant evidence that the average electricity consumption changes with the mean daily temperature. Table 7.20 Data for Exercise 7: Heating Costs Kwh Mo Day Tavg Kwh Tavg Day Mo 10 10 19 20 21 22 23 24 45 73 43 61 52 56 10 10 10 10 10 70 25 10 26 27 28 29 30 9 9 9 9 9 9 9 9 9 10 10 10 10 10 10 10 10 10 10 10 10 77.5 80.0 78.0 78.5 77.5 83.0 83.5 81.5 75.5 69.5 70.0 73.5 77.5 79.0 80.0 79.0 76.0 76.0 75.5 79.5 78.5 82.0 71.5 70.0 69 53 51 39 55 55 57 68 73 57 51 55 56 72 73 69 38 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4. 10 10 10 10 10 10 10 10 10 10 10 11 68.0 66.5 69.0 70.5 63.0 64.0 64.5 65.0 66.5 67.0 66.5 67.5 75.0 75.5 71.5 63.0 60.0 64.0 62.5 63.5 73.5 68.0 77.5 2 3 4 50 37 43 42 25 31 31 32 35 32 34 35 41 51 34 19 19 30 23 35 29 55 56 5 6 7 8 9 10 11 12 11 11 11
