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The distribution of a sample means is not always a normal distribution. Under what circumstances will the distribution of sample means definitely be normal? Check

The distribution of a sample means is not always a normal distribution. Under what circumstances will the distribution of sample means definitely be normal? Check all that apply.

a. When it is based on small samples (n<30)

b. When it is based on a population that does not have a normal distribution.

c. When it is based on a large samples (n >30)

d.When it is based on samples selected from a population that has a normal distribution.

e.When it is based on large samples (n> 5)

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