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We record the amount of time (xin minutes) per day that a group of 12 high school students spend ...

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We record the amount of time (in minutes) per day that a group of 12 high school students spend using their cell phone (texting, talking, and web use). We also record the overall GPA (y) of each student. Following is a regression summary for these data:

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)

Textbook

Introductory Statistics: A Problem-Solving Approach

Edition: 3rd
Author:
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sillysquirrelsillysquirrel
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