 Practice - Bivariate Statistics (Level C) Terms of Use    Contact Person: Donna Roberts  1.
 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:    2.
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

3.
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 4.
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. Based upon the model equation, what is the best prediction of the total calories for a sandwich with 36 total grams of fat?

Choose:
 630 611 610 598

5.
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.

6.
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 7.
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:
 10.2 10.5 11 11.2 8.
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 9.
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:      