Suppose we want to compare the GPA for students in at least three different social classes (Upper, Middle, Working).  We obtain GPA records for a randomly selected set of 30 students, ten from each social class group.  What test should you use and why?

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Q: Define the test variable?

A: Introduction A variable is a characteristic that is being tested.

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A: Introduction A variable is a no., characteristic which can be counted or measured.

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Q: If Gena's score is 85, the class average is 82, and the SD is 4, what is Gena's Z-score?

A: If Gena's score is 85, the class average is 82, and the SD is 4, what is Gena's Z-score?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.