If our sample size is small (n<30), we can assume the sample mean has a normal distribution. True O False
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- When should a s distribution be used? When there are how many cases in a sample? When should a t distribution be used? When there are how many cases in a sample?The formula for finding a z score for an individual value when there is a normal distribution is z = mean – value / Standard deviation True FalseIf the sample size is 8 then the degree of freedom when using T distribution is equal ?
- Supp ok se you did not know that x had a normal distribution. Would you be justified in saying that the distribution is approximately normal if the sample size were n=12True? Determine whether the following statement is true: When random samples of 50 men and 50 women are obtained and we want to test the claim that men and women have different mean annual incomes, there is no need to confirm that the samples are from populations with normal distributions.The distribution of average hours worked per week for random samples of 1000 workers in the U.S. has a mean of 40 and a standard error of 0.04 The distribution in this scenario is a: sampling distribution sample distribution population distribution
- Part 1. The central limit theorem only applies when the original distribution is normal. True or false? Part 2. The shape of the t distribution is impacted by the size of the sample used to generate it. True or false?If the sample size is large, the normal distribution could be used for the interval estimate of the population proportion pTrue or False
