A consumer group collected information on HDTVs. They created a linear model to estimate the cost of an HDTV (in $) based on the screen size (in inches). Which is the most likely value of the slope of the line of best fit?
A) 7
B) 0.70
C) 700
D) 7000
E) 70

Question

Quizplus · Accepted Answer

The slope of the line of best fit represents the change in the dependent variable (cost of HDTV) for a one-unit change in the independent variable (screen size). Since the cost of an HDTV typically increases as the screen size increases, the slope is likely to be positive. Among the given choices, only E (70) is a positive value that represents a reasonable change in cost for a one-inch increase in screen size.

A Consumer Group Collected Information on HDTVs