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 2 years 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...
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
3.32
Yes
3.86
Yes
3.72
No
2.93
No
3.88
No
3.46
No
2.71
No
3.86
No
2.84
(a) Code the dichotomous variable and then compute a
point-biserial correlation coefficient. (Round your answer to three
decimal places.)
Is the Wonderlic test a good predictor? why or why not?
Is the Wonderlic test a good predictor? why or why not?
Based on the Sporty Cars data, is "road test" a good predictor of Price at the...
Based on the Sporty Cars data, is "road test" a good predictor
of Price at the 95% confidence level?
Select one: a. No, the R^2 statistic indicates that only 30% of
the variability in price is explained by road test. b. No, the
F-statistic indicates that the regression does not explain price
significantly at the ninety five percent level. c. No, the
t-statistic indicates that the coefficient on road test is not
significantly different than zero at the 95% confidence...
It is believed that standardized test scores, such as SAT, is a good predictor of first-year...
It is believed that standardized test scores, such as SAT, is a
good predictor of first-year college students' GPA. x 1200 1120
1000 1420 1280 750 1100 y 3.2 2.5 2.7 3.5 2.9 2.2 2.3 1. Find the
the correlation coefficient. Round your final answer to four
decimal places. r = 2. Write the regression equation below. Round
all numbers to four decimal places. ˆ y = 3. Using the data shown
above, predict a student's first-year GPA when the...
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
interruptions, providing numerical justification (test statistic
and
P-value) for your conclusion. Carefully interpret what the
estimated model tells you about how
the expected number of interruptions changes as the daily usage
changes.
DATA four;
INPUT interruptions usage;
cards;
0 104.2
2 124.6
5 176.3
6 169.3
1 104.6
2 115.8
3 127.8
6 179.4
8 210.5
4 126.7
0 100.5
1 119.5
1 123.8
0 106.4
4 156.7
3 148.2...
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,
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,
H0 : μ =
3.2 vs. Ha: μ ≠
3.2
with a...
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