Flag question: Question 1

Question 1

2pts

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

Group of answer choices

r2

r

Flag question: Question 2

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

Independent variable decreases

Independent variable would remain the same

Cannot determine from information given

Independent variable increases

Flag question: Question 3

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

Flag question: Question 4

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 quality of the lesson

Student test scores

The length of the lesson

The number of students in the class

Flag question: Question 5

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

m

r

Flag question: Question 6

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

To the right of 0

To the left of 0

Below 0

Above 0

Flag question: Question 7

Question 7

2pts

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

Group of answer choices

xi

(xi, yi)

b

Flag question: Question 8

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

= 10.21x - 0.29

= 0.29x - 10.21

Flag question: Question 9

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=44.

Group of answer choices

260.4

92.9

Meaningless result

90.6

Flag question: Question 10

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=240.

Group of answer choices

-4.6

Meaningless result

4.6

24.2

Flag question: Question 11

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=47.

Group of answer choices

Meaningless result

-204.2

-209.4

209.4

Flag question: Question 12

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

-0.427

-0.033

0.033

0.427

Flag question: Question 13

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

0.982

-0.982

0.241

-0.241

Flag question: Question 14

Question 14

2pts

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

Group of answer choices

52.1%

50.0%

47.9%

48.8%

Flag question: Question 15

Question 15

2pts

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

Group of answer choices

42.2%

57.8%

82.2%

17.8%

Flag question: Question 16

Question 16

2pts

(CO 6) If the explanatory variables explained more than 20% of the variation in the response variables, which of the following would be true?

Group of answer choices

The coefficient of determination is below 0.2

There are two explanatory variables

The coefficient of determination is above 0.2

There are two response variables

Flag question: Question 17

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

54.31 inches

51.01 inches

48.10 inches

51.46 inches

Flag question: Question 18

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

18.52 days

17.12 days

16.43 days