Scatter plots and lines of best fit

Describe association, sketch a trend line, and use its equation to predict.

Standards:8.SP.A.18.SP.A.2S-ID.B.6

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

A student collected data on study time (hours) and test scores. The line of best fit has equation y = 8x + 45. Predict the test score for a student who studies for 5 hours.

Question 2 of 3

A biologist recorded the age (in years) and mass (in kg) of 6 dolphins. The line of best fit for the data is y = 12x + 8. Estimate the mass of a dolphin that is 4 years old.

Question 3 of 3

A coach recorded the number of practice sessions and free throws made by 6 basketball players. The scatter plot shows the data, and the line of best fit has equation y = 12x + 8. How many free throws should a player who attends 4 practice sessions be expected to make?

How this fits in

Scatter plots and lines of best fit is one skill in the Statistics & Probability unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

Practice scatter plots and lines of best fit until it sticks

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