Which of the statements is incorrect? If the population distribution is Normal, the sample mean will be approximately Normally distributed even if sample size was small. If the population distribution...

Extracted text: Which of the statements is incorrect? If the population distribution is Normal, the sample mean will be approximately Normally distributed even if sample size was small. If the population distribution is not Normal, the sample mean will be approximately Normally distributed if sample size was large (at least 30). If the population distribution is not Normal, the sample mean will be approximately Normally distributed if the sample size is small enough (less than 30). If the population distribution is not Normal, the sample mean may not be Normally distributed for small sample sizes (smaller than 30).