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Line (Curve) of Best Fit - Desmos Graphing Calculator

Last updated over 3 years ago
25 questions
For #1-3, tell whether x and y show a positive correlation, a negative correlation, or relatively no correlation.
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For #4-9, use your graphing calculator to find the equation of the line of best fit (y=mx+b). Round slope and y-intercept to the nearest tenth. If your answer isn't showing as correct, check with me and we will see if it is calculator differences...
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In the following problems (Number 8 - 19), find the equation for the line of best fit. Then evaluate it for the given x or y values. Round to the nearest tenth!
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Approximate the value of y for x = 3.

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Approximate the value of x for y = 3.

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Approximate the value of y for x = 4.

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Approximate the value of x for y = 4.

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Approximate the value of y for x = 5.

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Approximate the value of x for y = 5.

Use the data in the chart below for problems 20-25.

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Find the equation of the line of best fit. Write it in slope-intercept form. Round your slope and intercept to the nearest tenth!

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Using your equation from #20, what grade would you expect someone who studied for 7 hours to get?

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Is your prediction in #21 interpolation or extrapolation?

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Use your equation to predict the exam score for a student who spent 15 hours studying.

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Is your prediction in #23 interpolation or extrapolation?

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Which type of prediction is more reliable in this situation (and most), interpolation or extrapolation? Why?