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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.
Student
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?
X is the independent variable Hours of video per week.
Y is the dependent variable Number of days absent.
2.
Calculate the mean of X
6.50
3.
Calculate the mean of Y
4.00
4.
Calculate the Variance of X
16
5.
Calculate the Variance of Y
4.86
6.
Calculate the Standard Deviation of X
4
7.
Calculate the Standard Deviation of Y
2.20
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Calculate the Covariance of X,Y
7
9.
Using the above information calculate
b
(the slope).
0.44
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This note was uploaded on 07/13/2011 for the course SOC 301 taught by Professor Heberle during the Spring '11 term at University of Louisville.
 Spring '11
 Heberle

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