Question
In: Math
To test whether extracurricular activity is a good predictor of college success, a college administrator records...
To test whether extracurricular activity is a good predictor of college success, a college administrator records whether students participated in extracurricular activities during high school and their subsequent college freshman GPA.
|
Extracurricular Activity |
College Freshman GPA |
|---|---|
| Yes | 3.48 |
| Yes | 3.30 |
| Yes | 3.87 |
| Yes | 3.75 |
| No | 3.00 |
| No | 3.86 |
| No | 3.39 |
| No | 2.75 |
| No | 3.86 |
| No | 2.76 |
(a) Code the dichotomous variable and then compute a point-biserial correlation coefficient. (Round your answer to three decimal places.)
2. A psychologist noted that people have more difficulty sleeping in a bright room than in a dark room. She measured whether the intensity of the light could predict the time it took a sample of 4 participants to fall asleep. The data for this hypothetical study are listed in the following table.
| Intensity
of Light (in watts) |
Time It
Took to Sleep (in minutes) |
|---|---|
| X | Y |
| 5 | 13 |
| 10 | 20 |
| 20 | 32 |
| 40 | 37 |
Compute an analysis of regression for this hypothetical study.
(Round your answers to two decimal places.)
| Source
of Variation |
SS | df | MS | Fobt |
|---|---|---|---|---|
| Regression | ||||
| Residual (error) | ||||
| Total |
3.
Solutions
milcah answered 1 year agoRelated Solutions
To test whether extracurricular activity is a good predictor of college success, a college administrator records...
To test whether extracurricular activity is a good predictor of
college success, a college administrator records whether students
participated in extracurricular activities during high school and
their subsequent college freshman GPA.
Extracurricular
Activity
College
Freshman GPA
Yes
3.57
Yes
3.34
Yes
3.90
Yes
3.67
No
3.00
No
3.88
No
3.45
No
2.80
No
3.90
No
2.82
A) Code the dichotomous variable and then compute a
point-biserial correlation coefficient. (Round your answer to three
decimal places.)
_____
To test whether extracurricular activity is a good predictor of college success, a college administrator records...
To test whether extracurricular activity is a good predictor of
college success, a college administrator records whether students
participated in extracurricular activities during high school and
their subsequent college freshman GPA.
LEFT side of column: Activity RIGHT side: College GPA
(a). Code the dichotomous variable and then compute a
point-biserial correlation coefficient. (Round your answer to three
decimal places.)
Yes
3.54
Yes
3.28
Yes
3.96
Yes
3.71
No
3.00
No
3.82
No
3.43
No
2.79
No
3.89
No
2.75
To test whether extracurricular activity is a good predictor of college success, a college administrator records...
To test whether extracurricular activity is a good predictor of
college success, a college administrator records whether students
participated in extracurricular activities during high school and
their subsequent college freshman GPA.
Extracurricular
Activity
College
Freshman GPA
Yes
3.49
Yes
3.31
Yes
3.94
Yes
3.69
No
2.95
No
3.86
No
3.47
No
2.76
No
3.85
No
2.78
(a) Code the dichotomous variable and then compute a
point-biserial correlation coefficient. (Round your answer to three
decimal places.)
(b) Using a two-tailed test...
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Select one: a. No, the R^2 statistic indicates that only 30% of
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Formally assess whether usage is a significant predictor of mean interruptions, providing numerical justification (test statistic...
Formally assess whether usage is a significant predictor of mean
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and
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estimated model tells you about how
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DATA four;
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0 104.2
2 124.6
5 176.3
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The state of Oregon would like to test whether the average GPA of college students is...
The state of Oregon would like to test whether the average GPA
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Sample mean, x ¯
3.18
Sample size, n
10,000
Sample standard deviation, s
0.46
Refer to the information in the previous problem.
Suppose we test like to test the hypotheses,
H0 : μ =
3.2 vs. Ha: μ ≠
3.2
with a...
The state of Oregon would like to test whether the average GPA of college students is...
The state of Oregon would like to test whether the average GPA
of college students is different than 3.2 or not for scholarship
purposes. They take a random sample of 1000 college students in
Oregon. Here is the summary statistics.
Sample mean, x ¯
3.18
Sample size, n
10,000
Sample standard deviation, s
0.46
Refer to the information in the previous problem.
Suppose we test like to test the hypotheses,
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Student Before After
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2 28 29
3 30 31
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