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Chapter 3: Q T3.3. (page 215)

Scientists examined the activity level of 7 fish at different temperatures. Fish activity was rated on a scale of 0 (no activity) to 100 (maximal activity). The temperature was measured in degrees Celsius. A computer regression printout and a residual plot are provided. Notice that the horizontal axis on the residual plot is labeled 鈥淔itted value,鈥� which means the same thing as 鈥減redicted value.鈥�

What is the correlation between temperature and fish activity?

a. 0.95

b. 0.91

c. 0.45

d. 鈥�0.91

e. 鈥�0.95

Short Answer

Expert verified

The correct option is (e)鈥�0.95

Step by step solution

01

Given information

r2=91%=0.910
02

Explanation

In the column coefficient of the computer output, the slope of the least-squares regression line is the row "Temperature."

b1=鈭�3.2167

The slope is negative, indicating that the variables have a negative relationship, and so the linear correlation coefficient r is negative.

So

Hence, the correct option is (e).

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Most popular questions from this chapter

Driving speed and fuel consumption Exercise 9 (page 171) gives data on the fuel consumption y of a car at various speeds x. Fuel consumption is measured in liters of gasoline per 100 kilometers driven, and speed is measured in kilometers per hour. A statistical software package gives the least-squares regression line y^=11.058鈥�0.01466x. Use the residual plot to determine if this linear model is appropriate.

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