The level of significance is

	usually set at 90%, 95% or 99%.
	the probability of a Type II error.
	the probability of a Type I error.
	denoted by

Which of the following is NOT an assumption of the regression models?

	The mean of the probability distribution of the error terms should be zero.
	The variance of the the probability distribution of the error terms is constant.
	The error terms should be normally distributed
	The error terms are dependent

According to the central limit theorem

	The standard deviation of the sample mean is equal to the population standard deviation.
	The sample mean is equal to the population mean
	The probability distribution of the sample mean is normal if sample size is large enough.
	The probability distribution of the sample mean is unknow regardless of the sample size