Question 1

2pts

(CO 6) The coefficient of determination 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

Cannot determine from information given

Independent variable would remain the same

Independent variable decreases

Independent variable increases

Flag question: Question 3

Question 3

2pts

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

x245287198189176266210155

y50801107844575144

Group of answer choices

= 45.69x + 0.09

= 45.69x - 0.69

cannot be determined

= 0.09x + 45.69

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 number of classes taken

The student

Their GPA

The higher quality diet

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) 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, the other decreases

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

Flag question: Question 7

Question 7

2pts

(CO 6) What would be the notation for an estimate of y for a specific value of x?

Group of answer choices

yi

b

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

= -0.44x + 2.68

= -2.68x + 0.44

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=56.

Group of answer choices

127.7

318.7

121.1

Meaningless result

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=295.

Group of answer choices

27.5

-7.9

20.8

Meaningless result

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=39.

Group of answer choices

97.0

Meaningless result

174.2

-169.0

Flag question: Question 12

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

-0.345

0.294

-0.294

Flag question: Question 13

Question 13

2pts

(CO 6) If the linear correlation coefficient is -0.328, what is the value of the coefficient of determination?

Group of answer choices

0.108

0.656

-0.108

-0.164

Flag question: Question 14

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

20.8%

79.2%

30.8%

30.2%

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%

79.8%

26.2%

20.2%

Flag question: Question 16

Question 16

2pts

(CO 6) If the independent variables explained less than 20% of the variation in the dependent variables, which of the following would be true?

Group of answer choices

There are two independent variables

The coefficient of determination is below 0.2

There are two dependent variables

The coefficient of determination is above 0.2

Flag question: Question 17

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

58.65 inches

53.61 inches

42.75 inches

43.83 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 11.7 weekly hours of other activities and a 10.1 reading grade level.

Group of answer choices

17.81 days

23.99 days

20.92 days

13.16 days