1. GPA of graduate students of a University is not normally distributed. If we t

Question

1. GPA of graduate students of a University is not normally distributed. If we take similar samples (same size samples) from these students, then:

A. distribution of samples mean is not normal. B. samples mean is always less than population mean. C. distribution of samples mean is approximately normal if the sample size is greater than 30. D. distribution of samples mean is approximately normal if the sample size is at least 10% of the population mean. E. Both a and b are correct.

2. For a normal distribution, approximately what is the percentage of scores that falls between ?+? and ?+2?? A. 13.6% B. 2.3% C. 34% D. 9.8%

Explanation / Answer

1. distribution of samples mean is approximately normal if the sample size is atleast 10% of the population mean.

2. Percentage of scores between u + s and u + 2s is equal to

P( 1 < Z < 2) * 100% = 13.6%

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