Questions 117: A researcher wants to know about the relationship between
hours middle school students spend playing video games per week and days
out sick from school per year. Specifically she wants to know if more video
game watching leads to more sick days. The following is a hypothetical set
of data for those two variables. Answer the following questions based on
the given data.
Stude
nt
Hours
of Video
per
Week
Number of
days absent
due to
sickness
per year
1
5
6
2
14
7
3
2
1
4
10
5
5
6
5
6
4
3
7
8
4
8
3
1
1.
Which is the X variable and which is the Y variable?
2.
Calculate the mean of X
3.
Calculate the mean of Y
4.
Calculate the Variance of X
5.
Calculate the Variance of Y
6.
Calculate the Standard Deviation of X
7.
Calculate the Standard Deviation of Y
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8.
Calculate the Covariance of X,Y
9.
Using the above information calculate
b
(the slope).
10.
Calculate
a
.
11.
What is the regression equation, or model?
12.
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 Spring '11
 Heberle
 Statistics, Regression Analysis, Standard Deviation, Variance

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