(CO 6) The sample 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 negative linear correlation. Does the independent variable increase or decrease as the dependent variable increases?

Group of answer choices

Independent variable would remain the same

Independent variable increases

Cannot determine from information given

Independent variable decrease

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Question 3

2pts

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

x245287198189176266210255

y5032557844415160

Group of answer choices

cannot be determined

= -0.18x + 93.15

= 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 dependent variable that corresponds to the value of xiwould be given the notation of:

Group of answer choices

b

m

y1

yi

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Question 6

2pts

(CO 6) A scatter plot generally shows the dots going from high y values and low x values, to low 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, the other decreases

Positive. As one variable increases, the other decreases

Negative. As one variable increases, so does the other

Positive. As one variable increases, so does the other

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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

b

xi

(xi, yi)

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Question 8

2pts

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

x78594102

y41283793

Group of answer choices

= 0.39x - 4.80

= 0.39x + 4.08

= -0.40x - 4.80

= 0.40x + 4.08

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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

127.7

Meaningless result

318.7

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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

6.92

-8.02

Meaningless result

27.62

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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

-239.4

244.6

Meaningless result

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

0.345

0.294

-0.345

-0.294

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Question 13

2pts

(CO 6) If the linear correlation coefficient is -0.491, what is the value of the coefficient of determination?

Group of answer choices

-0.241

-0.982

0.982

0.241

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Question 14

2pts

(CO 6) If the coefficient of determination is 0.521, what percentage of the data about the regression line is explained?

Group of answer choices

47.9%

48.8%

50.0%

52.1%

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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

17.8%

57.8%

82.2%

42.2%

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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

The coefficient of determination is above 0.8

There is more than one explanatory variable

The correlation coefficient is above 0.8

There is more than one response variable

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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 41.8 inches tall and whose mother is 49.2 inches tall.

Group of answer choices

56.44 inches

44.95 inches

46.56 inches

44.34 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 12.8 weekly hours of other activities and a 10.9 reading grade level.

Group of answer choices

25.82 days

74.43 days

26.26 days

18.93 days