Practice Bivariate Statistics - MathBitsNotebook(JR)

Practice - Bivariate Statistics (Level C)
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Directions: Read carefully.

A scatter plot is shown in the coordinate plane.

Which of the following graphs most closely approximates a line of best fit for the data in this scatter plot?

Choose:

Which statement is true about the data in a scatter plot where the y-values are decreasing as the x-values are increasing?

Choose:

the data can be modeled by a vertical line

the data can be modeled by a horizontal line

the data can be modeled by a line with a positive slope

the data can be modeled by a line with a negative slope

A scatter plot of data is shown at the right. Which association (correlation) best describes the data?

Choose:

positive linear association

negative linear association

non-linear association

no association

The table below shows the relationship between total fat grams and the total calories in a selection of fast food sandwiches. This data can be modeled by the line y = 13x + 143, where x is the total fat in grams and y is the total calories.

calorietable

Based upon the model equation, what is the best prediction of the total calories for a sandwich with 36 total grams of fat?

Choose:

The number of hours spent babysitting and the amount of money earned is plotted at the right. The line of best fit has the equation y = 1.2x + 2.

Which of the following statements can be considered a valid prediction based upon this data?

Choose:

For each additional hour spent babysitting, an additional $1.20 will be earned.

For each additional hour spent babysitting, an additional $2.00 will be earned.

For babysitting 10 hours, you can expect to earn $20.00.

For babysitting 10 hours, you can expect to earn $18.20.

A scatter plot of data is shown at the right. Which association (correlation) best describes the data?

Choose:

positive association

negative association

non-linear association

no association

The table shows the number of grams of carbohydrates, x, and the number of calories, y, of six different foods. The line of best fit is
y = 14.1x + 5.8.
Using the equation, estimate the number of carbohydrates in a food containing 154 calories.

Choose:

A scatter plot of data is shown at the right. Which statement best describes the association between hours of sleep and test scores?

Choose:

there is no association

a non linear association

a positive linear association and one outlier

a negative association and one outlier

Data is randomly collected from students regarding the number of hours they slept the night before a big test, and their scores on the test.

The scatter plot displays the data.
The line of best fit has the equation y = 3.2x + 64.4.

Which of the following statements best describes what the slope and y-intercept of the equation represent?

Choose:

The slope represents an increase of 3.2 points in test score for every additional hour of sleep; the y-intercept is the most likely score (64.4) with no sleep before the test.

The slope represents an increase of 5 points in test score for every additional hour of sleep; the y-intercept is the most likely score (0) with no sleep before the test.

The slope represents an increase of 3.2 points in test score for every additional hour of sleep; the y-intercept is the most likely score (67.6) with no sleep before the test.

The slope represents an increase of 5 points in test score for every additional hour of sleep; the y-intercept is the most likely score (64.4) with no sleep before the test.

10.

Which equation best models this set of data?

Choose:

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Topical Outline | JrMath Outline | MathBitsNotebook.com | MathBits' Teacher Resources
Terms of Use Contact Person: Donna Roberts