The national average on the ACT math test is 20.5. A sample of n = 9 incoming college freshmen is tested at a local university. The mean of the sample is M = 22.7 with a s = 4. Does the sample mean differ significantly from the national average? Test at α = .05.

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The Answer of The national average on the ACT math test is 20.5. A sample of n = 9 incoming college freshmen is tested at a local university. The mean of the sample is M = 22.7 with a s = 4. Does the sample mean differ significantly from the national average? Test at α = .05.

The National Average on the ACT Math Test Is 20