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a. Plot the points in a scatterplot. Does it appear that the relationship between x and y is linear? How would you describe the direction and strength of the relationship?
b. Calculate the value of r2. What percentage of the overall variation is explained by using the linear model rather than to predict the response variable y?
c. What is the regression equation? Do the data provide evidence to indicate that x and y are linearly related? Test using a 5% significance level.
d. Given the results of parts b and c, is it appropriate to use the regression line for estimation and prediction? Explain your answer.
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a b C The plot is shown below Notice that there is a strong positive relationship between x and y ei...View the full answer
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Related Book For 
Introduction To Probability And Statistics
ISBN: 9781133103752
14th Edition
Authors: William Mendenhall, Robert Beaver, Barbara Beaver
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