a) Is the correlation positive or negative? ___________________
d) Predict sales if the temperature is : $_______________
| Hours Studied (x) | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 4 | |------------------|----|----|----|----|----|----|----| | Test Score (y) | 55 | 65 | 70 | 75 | 80 | 85 | 95 |
_________________________ Date: _________________________ Period: _________________________
a) Positive or negative correlation? ___________________
c) Write the equation: ___________________
b) Write the equation of your line: ___________________
e) Is it reasonable to use this line to predict sales at ? Why or why not? 5. Challenge – Interpret the Line A student drew a line of best fit for a scatter plot with the equation: [ y = -2.5x + 45 ]
| Temp (°F) | 65 | 70 | 72 | 78 | 82 | 85 | 90 | |-----------|----|----|----|----|----|----|----| | Sales ($) | 150| 180| 200| 240| 300| 330| 400|
c) Predict the test score for a student who studies : ________ 2. Age of Car vs. Value A used car dealer records the age of cars (in years) and their selling price (in $1000s).
c) Predict the value of a car: $_______________ 3. Draw Your Own Line of Best Fit Plot the following points on the grid below (or sketch on your own paper):
(If no grid is available, describe where your line passes through two approximate points.) An ice cream shop records daily high temperature (°F) and ice cream sales ($).
(2, 4), (3, 5), (4, 7), (5, 8), (6, 9), (7, 12), (8, 14)
b) What does the slope mean in a real-world context? (Write a possible interpretation.)
a) Is the correlation positive or negative? ___________________
d) Predict sales if the temperature is : $_______________
| Hours Studied (x) | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 4 | |------------------|----|----|----|----|----|----|----| | Test Score (y) | 55 | 65 | 70 | 75 | 80 | 85 | 95 |
_________________________ Date: _________________________ Period: _________________________ lesson 2 homework practice lines of best fit
a) Positive or negative correlation? ___________________
c) Write the equation: ___________________
b) Write the equation of your line: ___________________ a) Is the correlation positive or negative
e) Is it reasonable to use this line to predict sales at ? Why or why not? 5. Challenge – Interpret the Line A student drew a line of best fit for a scatter plot with the equation: [ y = -2.5x + 45 ]
| Temp (°F) | 65 | 70 | 72 | 78 | 82 | 85 | 90 | |-----------|----|----|----|----|----|----|----| | Sales ($) | 150| 180| 200| 240| 300| 330| 400|
c) Predict the test score for a student who studies : ________ 2. Age of Car vs. Value A used car dealer records the age of cars (in years) and their selling price (in $1000s). Why or why not
c) Predict the value of a car: $_______________ 3. Draw Your Own Line of Best Fit Plot the following points on the grid below (or sketch on your own paper):
(If no grid is available, describe where your line passes through two approximate points.) An ice cream shop records daily high temperature (°F) and ice cream sales ($).
(2, 4), (3, 5), (4, 7), (5, 8), (6, 9), (7, 12), (8, 14)
b) What does the slope mean in a real-world context? (Write a possible interpretation.)