Chapter 4: Q. 7 (page 192)
7. Identify one use of a regression equation.
Regression equation is used for predict the values.
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For each exercise, determine the linear correlation coefficient by using
a. Define on page ,
b. Formula an page .
Compare your answer an para (a) and (b
Determine the linear correlation coefficient by formula and definition.
Age and Price of Orions. In Table , we provided data on age and price for a sample of Orions between and years old. On the Weiss Stats site, we have given the ages and prices for a sample of Orions between and years old.
a. Obtain a scatterplot for the data.
b. Is it reasonable to find a regression line for the data? Explain your answer.
11. Using a regression equation to make predictions for values of the predictor variable outside the range of the observed values of the predictor variable is called ________
High and Low Temperature. The data from Exercise 4.75 for average high and low temperatures in January for a random sample of cities are on the WeissStats site.
a. decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate. If so, then also do parts (b) and (c).
b. obtain the linear correlation coefficient.
c. interpret the value of in terms of the linear relationship between the variables in question.
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