MAT 157 Q10

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  1. A correlation coefficient of r = -0.675 was calculated for n = 12. Using Table I, with ?= 0.05, which of the following is correct?

  2. A study was conducted to determine if there was a relationship between

the prices a non-member of a club paid for various publications and the prices that a member paid for the same publications. Data are provided below. What is the value of .

Nonmember Price (x)

45

38

35

30

27

78

40

65

Member Price (y)

30

25

25

20

18

55

40

50

  1. A study was conducted to determine if there was a relationship between the prices a non-member of a club paid for various publications and the prices that a member paid for the same publications. Data are provided below. What is the value of ?

Nonmember Price (x)

45

38

35

30

27

78

40

65

Member Price (y)

30

25

25

20

18

55

40

50

  1. A study was conducted to determine if there was a relationship between the prices a non-member of a club paid for various publications and the prices that a member paid for the same publications. Data are provided below. What is the value of the linear correlation coefficient?

Nonmember Price (x)

45

38

35

30

27

78

40

65

Member Price (y)

30

25

25

20

18

55

40

50

  1. A study was conducted to determine if there was a relationship between the prices a non-member of a club paid for various publications and the prices that a member paid for the same publications. Data are provided below. What is the slope of the regression line?

Nonmember Price (x)

45

38

35

30

27

78

40

65

Member Price (y)

30

25

25

20

18

55

40

50

  1. A credit card company wants to see how strong the relationship is between the amount of money a person makes per year and the amount

they charge on their credit cards. There are 9 pairs of data. Using ? = 0.05 and table I, what are the critical values?

  1. A teacher wanted to see if there was a relationship between the number of absences (x) a student had in her class and the final grade (y) of the student. The y- intercept for the line of best fit was found to be 96.8 and the slope of the line was found to be -2.67. What would be the equation of the line of best fit?

  2. A correlation coefficient was computed for 10 sample points. The value of r was -0.68. Using the formula for the t-test, what is the test value that will be used to determine the significance of the correlation coefficient?

  3. What is the equation of the regression line for the following data points?

x

1

3

6

7

9

2

y

14

12

9

8

2

11

  1. A regression line was calculated as y' = 42.5 + 3.1x. What is the predicted value of y' when x = 2?

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