Question 1

2pts

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

Group of answer choices

r

r2

Flag question: Question 2

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 decrease

Cannot determine from information given

Independent variable increases

Independent variable would remain the same

Flag question: Question 3

Question 3

2pts

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

x245287198189176266210255

y5080557844575170

Group of answer choices

cannot be determined

= -0.14x + 28.43

= 0.14x + 28.43

= 0.14x - 28.43

Flag question: Question 4

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 student

The number of classes taken

The higher quality diet

Their GPA

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

m

r

r2

Flag question: Question 6

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, so does the other

Negative. As one variable increases, the other decreases

Positive. As one variable increases, so does the other

Positive. As one variable increases, the other decreases

Flag question: Question 7

Question 7

2pts

(CO 6) If there is a (-), or bar, above a variable, what does that indicate?

Group of answer choices

the value is an outlier

the value is the mean

the value is an estimate

the value is the standard deviation

Flag question: Question 8

Question 8

2pts

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

x915241319

y12837912

Group of answer choices

= 2.68x - 0.44

= 0.44x + 2.68

= -2.68x + 0.44

= -0.44x + 2.68

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=24.

Group of answer choices

91.2

51.2

Meaningless result

34.9

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=62.

Group of answer choices

-270.2

Meaningless result

275.4

-275.4

Flag question: Question 12

Question 12

2pts

(CO 6) If the linear correlation coefficient is 0.822, what is the value of the coefficient of determination?

Group of answer choices

-0.676

-0.907

0.907

0.676

Flag question: Question 13

Question 13

2pts

(CO 6) If the linear correlation coefficient is -0.256, what is the value of the coefficient of determination?

Group of answer choices

0.066

-0.512

-0.066

0.512

Flag question: Question 14

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%

50.0%

52.1%

48.8%

Flag question: Question 15

Question 15

2pts

(CO 6) If the coefficient of determination is 0.798, what percentage of the data about the regression line is unexplained?

Group of answer choices

8.0%

26.2%

79.8%

20.2%

Flag question: Question 16

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

The correlation coefficient is above 0.8

There is more than one response variable

The coefficient of determination is above 0.8

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

48.10 inches

51.01 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 12.8 weekly hours of other activities and a 10.9 reading grade level.

Group of answer choices

25.82 days

26.26 days

18.93 days

74.43 days