Quiz about Equations of the Line of Best Fit

Question 1

The scatter plot shows the time spent studying, x, and the quiz score, y, for each of 25 students. Using the points (0, 20) and (80, 90), write the equation of the line o best fit. Your slope should be in decimal form. Then predict the quiz score for a student who spent 50 minutes studying.

Accepted Answer

$$y=0.88x+20$$ A score of 64.

Answer

$$y=-0.88x+20$$

A score of 24.

Answer

$$y=-0.67x+20$$

A score of 14.

Answer

$$y=0.67x+20$$ A score of 54.

Question 2

What is the equation of the line of best fit?

Accepted Answer

y = -25x + 170

Answer

y = -5/8x + 170

Answer

y = 25x + 170

Answer

y = 5/8x + 170

Question 3

What is the line of best fit?

Accepted Answer

y = 5/3x + 375

Answer

y = 1/3x + 475

Answer

y = 5/3x + 3

Answer

y = 1/3x + 375

Question 4

Question 4.

Accepted Answer

y = 1.45x + 22

Answer

y = -2x + 15

Answer

y = 1.33x + 30

Answer

y = -1.5x + 24

Question 5

The graph above shows a line of best fit for data collected on the amount earned by waiters and waitresses last week in relation to the number of tables they served. What is the equation of the line of best fit?

Accepted Answer

y = (5/3) x + 375

Answer

y = (1/3) x + 475

Answer

y = (5/3) x + 475

Answer

y = (1/3) x + 375

Question 6

Which equation best represents the data?

Accepted Answer

y = 4/3x - 1

Answer

y = 3/4x + 1

Answer

y = -3/4x - 1

Answer

y = -4/3x - 1

Question 7

The graph shows a line of best fit for data collected on the amount of income earned by lawn companies in relation to the number of yards mowed. What is the equation of the line of best fit?

Accepted Answer

y = 30x

Answer

y = (3/2) x

Answer

y = 30x + 300

Answer

y = (3/2)x + 300

Question 8

The graph above shows a line of best fit for data collected on the distance bicyclists have remaining in relation to the amount of time they have been riding. What is the equation of the line of best fit?

Accepted Answer

y = -25x + 170

Answer

y = 25x + 170

Answer

y = -(5/8) x + 170

Answer

y = (5/8) x + 170

Question 9

What is the equation of the line of best fit?

Accepted Answer

y= $$-\frac{1}{2}x\ +\ 6$$

Answer

y= $$\frac{1}{2}x\ +6$$

Answer

y= 6x + 2

Answer

y = -2x +6

Question 10

What is the equation of the line of best fit?

Accepted Answer

y= $$\frac{1}{2}x\ +3$$

Answer

y= 2x

Answer

y=3x+7

Answer

y= $$-\frac{1}{2}x\ -3$$

Question 11

Is this line an accurate line estimate of best fit for the data?

Accepted Answer

No

Answer

Yes

Question 12

What is the equation of the line of best fit

Accepted Answer

y= -2x + 10

Answer

y= 10x+ 2

Answer

y= 10

Question 13

The equation of the trend line is y= 1/2x +1
How many laps can a bicycle make around the park in 23 minutes?

Accepted Answer

44 laps

Answer

12 1/2 laps

Answer

23 laps

Question 14

What is the y-intercept?

Accepted Answer

3

Answer

-2

Answer

2

Answer

-3

Question 15

The equation of the trend line
is y= 1/2x +1
How many laps can a bicycle
make around the park in
23 minutes?

Accepted Answer

44 laps

Answer

12 1/2 laps

Answer

23 laps

Question 16

Which line is the best line of best fit?

Accepted Answer

b

Answer

a

Answer

c

Answer

i don't see any lines

Question 17

Which line is line of best fit for the data?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 18

Determine the predicted income if 22 hours were worked on an assembly job.

Accepted Answer

$449.60

Answer

$207.30

Answer

$691.90

Answer

$543.30

Equations of the Line of Best Fit

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