Swimming Average Narrative Historically, the Average Time It Takes Jessica to Swim the to Swim

question 44

Essay

Swimming Average Narrative
Historically, the average time it takes Jessica to swim the 200 m butterfly is 148.4 seconds. Jessica would like to know if her average time has changed. She records her time on 50 randomly selected occasions and computes the mean to be 147.8 seconds with a standard deviation of 2.3 seconds.
-Refer to Swimming Average Narrative. Compute the power of the test if Jessica's actual mean swimming time is 147.3 seconds. Interpret the results.

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