Concept explainers
Pitchers The table shows the Earned Run Average (ERA) and WHIP rating (walks plus hits per inning) for the top 40 Major League Baseball pitchers in the 2017 season. Top pitchers will tend to have low ERA and WHIP ratings. (Source: ESPN.com)
a. Make a scatterplot of the data and state the sign of the slope from the scatterplot. Use WHIP to predict ERA.
b. Use linear regression to find the equation of the best-fit line. Show the line on the scatterplot using technology or by hand.
c. Interpret the slope.
d. Interpret the y-intercept or explain why it would be inappropriate to do so.
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Introductory Statistics
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