Interpreting Line of Best Fit

Layla recorded her baby sister’s height, y, in inches, each month, x. The scatterplot shows her results.

Layla modeled the data approximately with the linear function y = 0.75x + 15. What does the slope of the line represent?

• Her sister grew about 15 inches each month.

• Her sister grew about 1 inch every 15 months.

• Her sister grew about 0.75 inch each month.

• Her sister grew about 1 inch every 0.75 month.

Tags

CCSS.HSF.LE.B.5

What is the meaning of the y-intercept? 

• The cost will increase by $12 per hour

• The initial fee is $15 before hourly charges

• The cost will increase by $15 per hour

• The initial fee before hourly charges is $12

Tags

CCSS.HSF.LE.B.5

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades. 

Tags

CCSS.8.EE.B.5

• Every 8.47 years, the tree grows 1 foot.

• Every year, the tree grows 8.47 feet.

• Every 0.96 years, the tree grows 1 foot.

• Every year, the tree grows about 0.96 ft.

Tags

CCSS.HSF.LE.B.5

• y = 1.45x + 22
• y = -2x + 15
• y = 1.33x + 30
• y = -1.5x + 24

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55

• 0

• 103

• 100

In the scatter plot, does the image shows a "Line of Best Fit"?

• Yes

• No

Tags

CCSS.8.EE.B.5

In the scatter plot, does the image shows a "Line of Best Fit"?

• Yes

• No

Tags

CCSS.8.EE.B.5

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades. 

Tags

CCSS.HSF.LE.B.5

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

• Yes

• No

Tags

CCSS.8.EE.B.5