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11/12/2018

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Quiz 7

Question 1 Which of the following would be the scatterplot for the given data?

x 4 7 8 12 14 18 y 21 29 29 42 28 41

a)



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b)

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c)



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d)

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e) None of the above

Question 2

What can be said about the relationship between the explantory variable and the response variable in the following scatterplot?



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a) There is a strong positive linear association.

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b) There is a strong negative linear association.

c) There is a weak positive linear association.

d) The explanatory variable causes the responses.

e) None of the above Question 3 Determine the correlation coefficient for the data shown in this table:

x 2 8 8 13 16 19 y 22 29 28 40 33 41

a) -0.8946 b) 0.4473 c) 0.8946 d) 0.8003 e) -0.8003 f) None of the above Question 4 Choose the best correlation coefficient for the data shown in this scatterplot:



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a) 0.4048 b) -0.4048 c) 1.6126 d) 0.8096 e) -0.8096 Question 5 Which of the following is a true statement? a) A negative correlation indicates that as values of x increase, values of y will decrease. b) The coefficient of determination can assume negative values. c) If there is no correlation between the independent and dependent variables, then the value of the correlation coefficient must be -1. d) The correlation coefficient r is always greater than 1. e) The variable that is being predicted in regression analysis is the independent variable. f) None of the above



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