Chapter 12: Q.35 (page 717)
How many hours will it take to mow all of the lawns? (When is ŷ = 0?)
Short Answer
The number of hours taken to mow all the lawns is 1.125
Chapter 12: Q.35 (page 717)
How many hours will it take to mow all of the lawns? (When is ŷ = 0?)
The number of hours taken to mow all the lawns is 1.125
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Get started for freeUse the following information to answer the next five exercises. A random sample of ten professional athletes produced the following data where is the number of endorsements the player has and is the amount of money made (in millions of dollars).
x | y | x | y |
0 | 2 | 5 | 12 |
3 | 8 | 4 | 9 |
2 | 7 | 3 | 9 |
1 | 3 | 0 | 3 |
5 | 13 | 4 | 10 |
What is the y-intercept of the line of best fit? What does it represent?
Ornithologists, scientists who study birds, tag sparrow hawks in \(13\) different colonies to study their population. They gather data for the percent of new sparrow hawks in each colony and the percent of those that have returned from migration.
Percent return:\(74; 66; 81; 52; 73; 62; 52; 45; 62; 46; 60; 46; 38\)
Percent new:\(5; 6; 8; 11; 12; 15; 16; 17; 18; 18; 19; 20; 20\)
a. Enter the data into your calculator and make a scatter plot.
b. Use your calculator’s regression function to find the equation of the least-squares regression line. Add this to your scatter plot from part a.
c. Explain in words what the slope and y-intercept of the regression line tell us.
When testing the significance of the correlation coefficient, what is the alternative hypothesis?
Emma’s Extreme Sports hires hang-gliding instructors and pays them a fee of per class as well as per student in the class. The total cost Emma pays depends on the number of students in a class. Find the equation that expresses the total cost in terms of the number of students in a class.
What does the correlation imply about the relationship between time (years) and the number of diagnosed flu cases reported in the U.S.?
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