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The fastballs of a random sample of high school baseball pitchers are timed with a radar...

The fastballs of a random sample of high school baseball pitchers are timed with a radar gun. The resulting 95% confidence interval for the mean fastball speed of high school baseball pitchers is 74.5 to 80.5 miles per hour (mph). This confidence interval supports which of the following statements?

Group of answer choices

The mean fastball speed of high school baseball pitchers is less than 79 mph.

The mean fastball speed of high school baseball pitchers is not 80 mph.

The mean fastball speed of high school baseball pitchers is less than 81 mph.

The mean fastball speed of high school baseball pitchers is greater than 77 mph.

Math   Statistics-And-Probability   
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Answer #1

95% confidence interval for the mean fastball speed of high school baseball pitchers is 74.5 to 80.5 miles per hour (mph).

The mean fastball speed of high school baseball pitchers is less than 79 mph.

Since the interval contains 79 and the values are more than 79 , hence FALSE

The mean fastball speed of high school baseball pitchers is not 80 mph.

Since the interval contains 80, hence FALSE

The mean fastball speed of high school baseball pitchers is less than 81 mph.

Since the interval does not contain 81 and all the values of the interval are smaller than 81, hence TRUE

The mean fastball speed of high school baseball pitchers is greater than 77 mph.

Since the interval does contain 77 and the values are more than 77 , hence FALSE

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