Unit 3 Summative Study Guide

Does this graph show an accurate line of best fit? Explain.

• Yes, because the line passes through all points.

• No, because the line does not pass through any points.

• Yes, because the line shows the general trend of the data.

• No, because the line is horizontal.

What is the equation of the line that goes through the points (4,6) and (2,12)?

• y = 3x + 2

• y = -3x + 18

• y = 2x + 4

• y = -2x + 14

Sketch a line of best fit, then determine the equation of the line.

• y = x + 7

• y = -x + 7

• y = -1/2x + 5

• y = 1/2x + 5

Write a statement that describes the scatter plot. Hint: Compare the y value to the x value.

• As age increases, watching TV decreases.

• As age increases, watching TV remains constant.

• As age increases, watching TV increases.

• There is no relationship between age and watching TV.

Which equation could be the line of best fit for the data that would have a positive association?

• y = -x + 50

• y = -x - 60

• y = -2/3x + 50

• y = x + 60

Write the coordinate of the outlier.

• (3, 5)

• (6, 3)

• (5, 8)

• (2, 9)

The equation y = -0.5x + 20 is used to describe a set of data about hours spent practicing (x) and mistakes made (y). Use the equation to estimate the number of mistakes made by a student who has practiced for 26 hours.

Based on the scatter plot data, how many minutes would it take to run 18 laps?

• 20 minutes

• 14 minutes

• 18 minutes

• 10 minutes

What is the most reasonable estimate for the semester score for a student that missed 20 days of school?

• 75

• 73

• 70

• 65

The researcher used the line y = -0.1x + 110 to model the data. When she substituted the value x = 65 into this equation, what did the result tell her?

• The exact value for the vision score of a 65-year-old

• The predicted value for the vision score of a 65-year-old

• The minimum possible value for the vision score of a 65-year-old

• The maximum possible value for the vision score of a 65-year-old