Question 1

2pts

(CO 6) The population correlation coefficient is represented by what notation?

Group of answer choices

r2

r

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Question 2

2pts

(CO 6) Two variables have a positive non-linear correlation. Does the independent variable increase or decrease as the dependent variable increases?

Group of answer choices

Independent variable increases

Independent variable would remain the same

Cannot determine from information given

Independent variable decreases

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Question 3

2pts

(CO 6) Find the regression equation for the following data set

x245287198189176266210255

y5032557844415160

Group of answer choices

= -0.18x - 93.15

cannot be determined

= 0.18x + 93.15

= -0.18x + 93.15

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Question 4

2pts

(CO 6) An instructor wants to determine if a longer lesson would improve student test scores. Which variable would be the explanatory variable?

Group of answer choices

The length of the lesson

Student test scores

The number of students in the class

The quality of the lesson

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Question 5

2pts

(CO 6) A value of the slope of the regression line would be given the notation of:

Group of answer choices

b

r2

r

m

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Question 6

2pts

(CO 6) The graph for a linear regression crosses the y axis in positive value. Where would the y-intercept of the regression line be located on the y-axis?

Group of answer choices

Above 0

To the left of 0

Below 0

To the right of 0

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Question 7

2pts

(CO 6) What would be the notation for one point on the scatter plot?

Group of answer choices

xi

b

(xi, yi)

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Question 8

2pts

(CO 6) Find the regression equation for the following data set

x3879426

y911837913

Group of answer choices

= 10.21x - 0.29

= -10.21x + 0.29

= -0.29x + 10.21

= 0.29x - 10.21

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Question 9

2pts

(CO 6) A data set whose original x values ranged from 28 through 49 was used to generate a regression equation of = 2.9x - 34.7. Use the regression equation to predict the value of y when x=56.

Group of answer choices

Meaningless result

318.7

127.7

121.1

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Question 10

2pts

(CO 6) A data set whose original x values ranged from 241 through 290 was used to generate a regression equation of = -0.06x + 9.8. Use the regression equation to predict the value of y when x=295.

Group of answer choices

27.5

Meaningless result

-7.9

20.8

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Question 11

2pts

(CO 6) A data set whose original x values ranged from 38 through 65 was used to general a regression equation of = -4.4x + 2.6. Use the regression equation to predict the value of y when x=55.

Group of answer choices

Meaningless result

-239.4

244.6

239.4

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Question 12

2pts

(CO 6) If the linear correlation coefficient is 0.587, what is the value of the coefficient of determination?

Group of answer choices

-0.294

0.294

-0.345

0.345

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Question 13

2pts

(CO 6) If the linear correlation coefficient is -0.677, what is the value of the coefficient of determination?

Group of answer choices

-0.458

0.458

0.339

-0.339

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Question 14

2pts

(CO 6) If the coefficient of determination is 0.792, what percentage of the data about the regression line is explained?

Group of answer choices

30.2%

20.8%

79.2%

30.8%

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Question 15

2pts

(CO 6) If the coefficient of determination is 0.618, what percentage of the data about the regression line is unexplained?

Group of answer choices

68.1%

38.2%

30.2%

61.8%

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Question 16

2pts

(CO 6) What is the primary difference between a simple linear regression and a multiple linear regression?

Group of answer choices

There is more than one explanatory variable

There is more than one response variable

The coefficient of determination is above 0.8

The correlation coefficient is above 0.8

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Question 17

2pts

(CO 6) The equation used to predict how tall a kitten will be as an adult is = 4.5 + 0.6x1 + 0.3x2, where x1 is the height of the sibling and x2 is the height of the mother. Use this equation to predict the height of a kitten whose sibling is 41.3 inches tall and whose mother is 44.9 inches tall.

Group of answer choices

42.75 inches

58.65 inches

43.83 inches

53.61 inches

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Question 18

2pts

(CO 6) The equation used to predict how many days it takes a 15-year old to read the first Harry Potter book is = 1.5 + 2.82x1 - 1.04x2 days, where x1 weekly hours of other activities and x2 is the reading grade level. Use this equation to predict how many days it will take to read this book for someone with 10.3 weekly hours of other activities and a 10.5 reading grade level.

Group of answer choices

20.4 days

17.6 days

19.6 days

20.8 days