Question

A researcher measures the relationship between sleep medication use (times used per week) and time spent working (in hours per week). Answer the following questions based on the results provided.

(A) Compute the Pearson correlation coefficient. (Round your answer to three decimal places)

(B) Multiply each measurement of drug use times 3 and recalculate the correlation coefficient. (Round your answer to three decimal places.)

(C) Divide each measurement in half for time spent working and recalculate the correlation coefficient. (Round your answer to three decimal places.)

Sleep Medication Use | Time Spent Working |
---|---|

8 | 15 |

3 | 37 |

7 | 20 |

2 | 32 |

Answer #1

A)

correlation coefficient r= |
S_{xy}/(√S_{xx}*S_{yy}) = |
-0.941 |

B)

correlation coefficient r= |
S_{xy}/(√S_{xx}*S_{yy}) = |
-0.941 |

c)

correlation coefficient r= |
S_{xy}/(√S_{xx}*S_{yy}) = |
-0.941 |

A researcher measures the relationship between sleep medication
use (times used per week) and time spent working (in hours per
week). Answer the following questions based on the results
provided.
Sleep
Medication Use
Time Spent
Working
10
16
5
40
7
20
4
32
1. Compute the Pearson correlation coefficient. (Round your
answer to three decimal places.
2. Multiply each measurement of drug use times 3 and recalculate
the correlation coefficient. (Round your answer to three decimal
places.)
3. Divide...

A researcher measures the relationship between sleep medication
use (times used per week) and time spent working (in hours per
week). Answer the following questions based on the results
provided.
Sleep
Medication Use
Time Spent
Working
10
18
5
38
8
20
3
32
Part (a)
Compute the Pearson correlation coefficient. (Round your answer
to three decimal places.)
Part (b)
Multiply each measurement of drug use times 3 and recalculate
the correlation coefficient. (Round your answer to three decimal
places.)...

A researcher measures the relationship between the number of
interruptions during a class and time spent "on task" (in minutes).
Answer the following questions based on the results provided.
Number of Interruptions Time Spent "On Task" 10 16 6 37 8 19 5 31
Part (a) Compute the Pearson correlation coefficient. (Round your
answer to three decimal places.) Part (b) Multiply each measurement
of interruptions times 3 and recalculate the correlation
coefficient. (Round your answer to three decimal places.) Part...

A researcher measures the relationship between the number of
interruptions during a class and time spent "on task" (in minutes).
Answer the following questions based on the results provided.
Number
of
Interruptions
Time Spent
"On Task"
9
16
4
38
6
20
2
31
Compute the Pearson correlation coefficient. (Round your answer
to three decimal places.)
Part (b)
Multiply each measurement of interruptions times 3 and
recalculate the correlation coefficient. (Round your answer to
three decimal places.)
Part (c)
Divide...

A researcher measures the relationship between the number of
interruptions during a class and time spent "on task" (in minutes).
Answer the following questions based on the results provided.
Number
of
Interruptions
Time Spent
"On Task"
11
18
5
37
9
18
4
31
Part (a)
Compute the Pearson correlation coefficient. (Round your answer
to three decimal places.)
Part (b)
Multiply each measurement of interruptions times 3 and
recalculate the correlation coefficient. (Round your answer to
three decimal places.)
Part...

A researcher measures the relationship between sleep medication
use (times used per week) and time spent working (in hours per
week). Are they significantly correlated? Conduct a hypothesis test
at the .05 significance level.
Sleep Medication Use
Time Spent Working
Deviation Scores
Sum of Squares
X
Y
X-Mx
Y-MY
(X-Mx)
(Y-MY)
(X-Mx)2
(Y-MY)2
8
18
3
40
6
20
2
32
Mx=
MY =
SSXY=
SSX=
SSY=
Hypotheses:
Critical Value:
r =
Decision:

A researcher measures the relationship between Internet use
(hours per week) and social interaction (hours per week) in a
sample of 10 students. The following table lists the hypothetical
results of this study. Internet Use Social Interaction X Y 6 5 8 7
4 7 7 7 12 5 5 8 3 2 5 4 2 9 12 2 (a) Compute the Pearson
correlation coefficient. (Round your answer to three decimal
places.) (b) Compute the coefficient of determination. (Round your...

A researcher measures the relationship between Internet use
(hours per week) and social interaction (hours per week) in a
sample of 10 students. The following table lists the hypothetical
results of this study.
Internet
Use
Social
Interaction
X
Y
7
4
9
6
5
6
7
6
13
5
3
6
4
2
7
6
2
11
12
4
A) Compute the Pearson correlation coefficient. (Round your
answer to three decimal places.)
_____
B) Compute the coefficient of determination. (Round...

A researcher measures the relationship between Internet use
(hours per week) and social interaction (hours per week) in a
sample of 10 students. The following table lists the hypothetical
results of this study.
Internet
Use
Social
Interaction
X
Y
6
4
7
5
5
7
8
5
13
4
3
6
3
4
6
6
2
9
10
4
(a) Compute the Pearson correlation coefficient. (Round your
answer to three decimal places.)
(b) Compute the coefficient of determination. (Round your...

A researcher measures the relationship between the number of
interruptions during a class and time spent "on task" (in minutes).
Answer the following questions based on the results provided.
Number of Interruptions (10, 4, 7, 4) Time Spent "On Task" (16, 37,
20, 32). A. Comput the Pearson Correlation Coefficient (round to
three decimals).

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