One Sample t-Test

Calculation: Whatcom (One-Sample T-Test)

A random sample of 22 Whatcom Community College students have a grade point average (GPA) of 5.0 in mathematics with a standard deviation of 0.452, where the GPA marks range from 1 (worst) to 6 (excellent). The grade point average (GPA) of all the Whatcom students from the past four years is known to be 4.7.

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Is the GPA of the 22 Whatcom students significantly different from the overall Whatcom GPA from the past 4 years?

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Note: Assume $\alpha = 0.05$ or our confidence is 95%

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