Patrons at a Local Batting Cage Complain That a Pitching

question 35

Multiple Choice

Patrons at a local batting cage complain that a pitching machine set to throw 80 mph is throwing too slowly.A random sample of 29 pitches from the machine yields an average speed of 79.25 mph with a standard deviation of 4.22 mph.Perform a hypothesis test to see if the average speed of this machine is less than 80 mph.Select the appropriate critical value (CV) , test statistic (TS) , and decision, and list H₀.(Use α = 0.01.)

• A) CV = -2.4671; TS = -0.96; fail to reject H₀t: the machine throws at less than 80 mph
• B) CV = -1.3125; TS = -0.82; fail to reject H₀: the machine throws at less than 80 mph
• C) CV = -2.2671; TS = -0.18; fail to reject H₀: the machine throws at less than 80 mph
• D) CV = -2.4671; TS = -0.96; fail to reject H₀: the machine throws at 80 mph

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