When can the central limit theorem be used to approximate the sampling distribution of x̄ by a normal curve?
a. It can be used when the standard deviation of the population is normally distributed.
b. It can be used only when the population distribution is normal.
c. It can be used when the population distribution is not normal and n is greater than 30.
d. It can be used when the population is skewed and n is less than 20.
Answer: c. It can be used when the population distribution is not normal and n is greater than 30.
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