Lesson 2 Homework Practice Lines Of Best Fit Here

_________________________ Date: _________________________ Period: _________________________

(2, 4), (3, 5), (4, 7), (5, 8), (6, 9), (7, 12), (8, 14)

(If no grid is available, describe where your line passes through two approximate points.) An ice cream shop records daily high temperature (°F) and ice cream sales ($).

e) Is it reasonable to use this line to predict sales at ? Why or why not? 5. Challenge – Interpret the Line A student drew a line of best fit for a scatter plot with the equation: [ y = -2.5x + 45 ] lesson 2 homework practice lines of best fit

b) Equation of line of best fit (approximate): ___________________

a) Positive or negative correlation? ___________________

b) Write the equation of your line: ___________________ ___________________ Find a set of real-world bivariate data

c) If x = 8, what is the predicted y-value? ___________________ Find a set of real-world bivariate data online or in another class (e.g., height vs. shoe size, years of education vs. salary). Create a small scatter plot and draw a line of best fit. Write the equation and one prediction. Teacher’s Tip: For questions involving drawing, encourage students to use a ruler and aim for a line that has roughly the same number of points above and below it.

a) Correlation: ___________________

d) Predict sales if the temperature is : $_______________ height vs. shoe size

a) Is the correlation positive or negative? ___________________

c) Write the equation: ___________________

b) Use two points from your line of best fit to find the slope. Show your work.

| Temp (°F) | 65 | 70 | 72 | 78 | 82 | 85 | 90 | |-----------|----|----|----|----|----|----|----| | Sales ($) | 150| 180| 200| 240| 300| 330| 400|