Solved

A Professional Baseball Player Changed His Throwing Motion to Increase

question 19

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 the p-value.
C) At the 1% significance level, can you conclude that the baseball player has increased the speed of his fastball? Explain.

Definitions:

IFRS

International Financial Reporting Standards are a set of accounting rules and standards developed by the International Accounting Standards Board (IASB) that guide the preparation of financial statements globally.

A political and economic union of 27 European countries that are located primarily in Europe, aimed at fostering economic cooperation and collective regulation.

Securities Commissions

Governmental or regulatory bodies responsible for overseeing and regulating the securities and investments market, ensuring fair practices.

Enforcement Agencies

Governmental or authoritative bodies responsible for ensuring compliance with laws, regulations, and standards within their jurisdiction.