For Exercises 37–51, do the following for the indicated data sets from the Section 4.1 exercises:

  1. Calculate the slope and the intercept of the regression line.
  2. State the regression equation in words.
  3. Interpret the value for the slope of the regression line, in terms of the variables from the particular exercise.
  4. Interpret the value for the intercept of the regression line, in terms of the variables from the particular exercise.

Question 4.135

videogamereg

37. Video Game Sales. The Chapter 1 Case Study looked at video game sales for the top 30 video games. The following table contains the total sales (, in game units) and weeks on the top 30 list of 5 randomly chosen video games.

Video game Total sales
in millions
of units 		Weeks
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
Table 4.50: Source: www.vgchartz.com.

4.2.37

(a) (b) The predicted total sales in millions of game units of a video game is 0.02 times the number of weeks on the top 30 list plus 0.45 million game units. (c) For each increase of 1 week on the top 30 list the predicted number of game units of that game sold increases by 0.02 million units. (d) The predicted number of game units for a game that has been on the top 30 list for weeks is 0.45 million units.