Question 1

2pts

(CO 6) An estimated value from a regression equation is represented by what notation?

Group of answer choices

x

r

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Question 2

2pts

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

Group of answer choices

Cannot determine from information given

Independent variable decreases

Independent variable would remain the same

Independent variable increases

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Question 3

2pts

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

x245287198189176266210155

y50801107844575144

Group of answer choices

= 45.69x + 0.09

= 0.09x + 45.69

cannot be determined

= 45.69x - 0.69

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Question 4

2pts

(CO 6) A student wants to determine if a higher quality diet will improve their grade point average. Which variable would be the explanatory variable?

Group of answer choices

The higher quality diet

Their GPA

The student

The number of classes taken

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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

r

m

b

r2

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Question 6

2pts

(CO 6) A scatter plot generally shows the dots going from low y values and low x values, to high y values and high x values. Is the slope of the regression line between these two variables positive or negative?

Group of answer choices

Negative. As one variable increases, so does the other

Positive. As one variable increases, the other decreases

Positive. As one variable increases, so does the other

Negative. As one variable increases, the other decreases

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Question 7

2pts

(CO 6) What would be the notation for the mean of the y values?

Group of answer choices

(x, y)

yi

b

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Question 8

2pts

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

x3879426

y911837913

Group of answer choices

= -0.29x + 10.21

= -10.21x + 0.29

= 0.29x - 10.21

= 10.21x - 0.29

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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

121.1

Meaningless result

318.7

127.7

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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=297.

Group of answer choices

27.62

6.92

Meaningless result

-8.02

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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

-239.4

244.6

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Question 12

2pts

(CO 6) If the linear correlation coefficient is 0.182, what is the value of the coefficient of determination?

Group of answer choices

-0.033

0.427

0.033

-0.427

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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

0.339

0.458

-0.458

-0.339

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Question 14

2pts

(CO 6) If the coefficient of determination is 0.276, what percentage of the data about the regression line is explained?

Group of answer choices

27.6%

24.2%

72.4%

32.4%

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Question 15

2pts

(CO 6) If the coefficient of determination is 0.422, what percentage of the data about the regression line is unexplained?

Group of answer choices

82.2%

57.8%

17.8%

42.2%

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Question 16

2pts

(CO 6) A regression equation cannot have more than one ____________ .

Group of answer choices

Correlation coefficient

Independent variable

Dependent variable

Coefficient of determination

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Question 17

2pts

(CO 6) The equation used to predict how tall a kitten will be as an adult is = 2.5 + 0.3x1 + 0.8x2, 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 42.3 inches tall and whose mother is 48.9 inches tall.

Group of answer choices

51.46 inches

54.31 inches

48.10 inches

51.01 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 is the 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 9.3 weekly hours of other activities and a 10.2 reading grade level.

Group of answer choices

20.59 days

17.12 days

18.52 days

16.43 days