Exercise on May16
1.
Which of the following situations has the most
obvious explanatory and response variables?
A)
The weight and height of a person.
B)
The amount of yearly rainfall and the yield of a
crop.
C)
A student’s grades in statistics and in French.
D)
The occupational class of a father and of a son.
2. Which of the following statements makes most sense?
A)
There is a high correlation between workers born in
December and the number of vacation days they
take in December.
B)
We found a low correlation ( r = 0.19 ) between the
number of sick days claimed each month and a
person’s age.
C)
The correlation between planting rate and yield of
beans was found to be 0.23 bushels.
D)
Students’ ratings of courses were found to be highly
correlated with the day of the week that surveys
were administered.
3. Question 1: Calculate the correlation coefficient for
the following variables:
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2
5
9
12
18
Y
22
20
19
17
12
A)
0.9815
B)
20.53
C)
– 0.9815
D)
– 0.60
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 Summer '07
 LIANG,FANG
 Regression Analysis, following statements, Correlation and dependence, Car dealership, defect percentage

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