The regression equation is

Sales/Week = 994 + 8.22 Intelligence + 49.7 Extroversion

Term Coef SE Coef T-Value P-Value

Constant 994 788 1.26 0.224

Intelligence 8.22 7.01 1.17 0.257

Extroversion 49.7 19.6 2.53 0.021

S R-sq R-sq(adj) R-sq(pred)

332.069 35.26% 27.65% 10.66%

Analysis of Variance

Source DF Adj SS Adj MS F-Value P-Value

Regression 2 1021166 510583 4.63 0.025

Error 17 1874584 110270

Total 19 2895750

Predicted Values for New Observations

New

Obs Fit SE Fit 90% CI 90% PI

1 2885.62 167.445 (2594.34, 3176.91) (2238.67, 3532.58)

2 3379.99 176.933 (3072.19, 3687.78) (2725.43, 4034.54)

3 2785.05 100.991 (2609.35, 2960.72) (2181.25, 3388.83)

Values of Predictors for New Observations

New

Obs Intelligence Extroversion

1 85 24

2 127 27

3 103 19

What is a 90% confidence interval for the average sales per week for all people with an intelligence score of 103 and an extroversion score of 19?

▸

(2594.34, 3176.91)

▸

(2609.35, 2960.72)

▸

(2181.25, 3388.83)

▸

(3072.19, 3687.78)