The regression equation is
GPA = 4.01 - 0.0153 CellTime
Predictor Coef SE Coef T P
Constant 4.0084 0.2486 6.12 0.000
CellTime -0.015334 0.003226 -4.75 0.001
S = 0.472864 R-Sq = 69.3% R-Sq(adj) = 66.3%
Analysis of Variance
Source DF SS MS F P
Regression 1 5.0519 5.0519 22.59 0.001
Residual Error 10 2.2360 0.2236
Total 11 7.2879
What is a 95% confidence interval for the average GPA change associated with a 1-min increase in average daily cell use (β1)?
(–0.0225,–0.0082)
(3.4545, 4.5623)
(–0.0212,–0.0095)
(3.5578, 4.4590)
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