Stat Homework
Smaxwell55
Stat1044.2HW.docxStat 104 Chapter 4 Name:________________________
4.2 Homework
page 218 #15, 27, 37
15. The values of x and y are as follows:
|
x |
Y |
|
-5 |
10 |
|
-4 |
18 |
|
-3 |
18 |
|
-2 |
26 |
|
-1 |
26 |
a) Calculate the slope b1 and the y value of the y intercept b0 for the regression line. Write the regression equation.
b) Interpret the values for b1 and b0.
27. Using the data from the previous problem (#15),
a. Predict the value of y for x = -5.
b. Calculate and interpret the prediction error.
c. State whether or not the prediction represents extrapolation.
37. The Chapter 1 Case Study looked at video game sales for the top 30 video games. The following table contains the total sales (y, in game units) and weeks on the top 30 list (x) of 5 randomly chosen video games.
|
Video game |
Total sales In millions Of units (y) |
Weeks (x) |
|
Super Mario Bros. U for WiiU |
1.7 |
78 |
|
NBA 2K14 for PS4 |
0.6 |
27 |
|
Battlefield 4 for PS3 |
0.9 |
29 |
|
Titanfall for Xbox One |
1.2 |
10 |
|
Yoshi’s New Island for 3DS |
0.2 |
10 |
a. Calculate the slope, b1, and the y value of the y intercept, b0, of the regression line.
b. State the regression equation in words. (See part c of the solution to example 6 on pages 210-211 for an example of what to say.)
c. Interpret the value for the slope b1 of the regression line, in terms of the variables from the problem. (See part b of the solution for example 7 on page 211 for an example of what to say.)
d. Interpret the value for the y intercept b0 of the regression line, in terms of the variables from the table. (See part a of the solution for example 7 on page 211 for an example of what to say.)
Stat 104 4.2 HW.docx
Fall 2020 Instructor J Hodgson Page 1 of 2
