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The Practice of Statistics | 5th Edition | ISBN: 9781464108730 | Authors: Daren S. Starnes, Josh Tabor
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How much gas? Joan is concerned about the amount of energy she uses to heat her home

Chapter 3, Problem 4

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QUESTION:

How much gas? Joan is concerned about the amount of energy she uses to heat her home. The graph below plots the mean number of cubic feet of gas per day that Joan used each month against the average temperature that month (in degrees Fahrenheit) for one heating season. Temperature (degrees Fahrenheit) 1000 20 25 30 35 40 45 50 55 60 0 800 600 400 200 Gas consumed (cubic feet) (a) Does the plot show a positive or negative association between the variables? Why does this make sense? (b) What is the form of the relationship? Is it very strong? Explain your answers. (c) Explain what the point at the bottom right of the plot represents.

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QUESTION:

How much gas? Joan is concerned about the amount of energy she uses to heat her home. The graph below plots the mean number of cubic feet of gas per day that Joan used each month against the average temperature that month (in degrees Fahrenheit) for one heating season. Temperature (degrees Fahrenheit) 1000 20 25 30 35 40 45 50 55 60 0 800 600 400 200 Gas consumed (cubic feet) (a) Does the plot show a positive or negative association between the variables? Why does this make sense? (b) What is the form of the relationship? Is it very strong? Explain your answers. (c) Explain what the point at the bottom right of the plot represents.

ANSWER:

Step 1 of 5

Using the graph below which plots the mean number of cubic feet of gas per day that Joan used each month against the average temperature that month (in degrees Fahrenheit) for one heating season, we can determine the following:

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