A Professional Baseball Player Changed His Throwing Motion to Increase

question 94

Essay

A professional baseball player changed his throwing motion to increase the velocity of his fastball.Before the change,the player threw his fastball at an average of 91 miles per hour.After the change in his throwing motion,the team watched him throw 64 fastballs with an average speed of 91.75 miles per hour and a standard deviation of 3 miles per hour.
a.Specify the null and alternative hypotheses to determine whether the baseball player increased the speed of his fastball.
b.Calculate the value of the test statistic and approximate the p-value.
c.At the 1% significance level,can you conclude that the baseball player has increased the speed of his fastball? Explain.

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Definitions:

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Entities consisting of one person or a group of people who share living accommodations and make joint or separate decisions in consumption and investment.

Normal Good

A Normal Good is a type of good for which demand increases when the income of the consumer increases and falls when the income decreases, assuming the price remains constant.

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A marketplace for the services of a factor of production, such as labor, capital, and land.

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The resources (such as labor, materials, and capital) used in the production process to create goods or services.