Estimate the population variance assuming homogeneity of variance?

For the following​ case, assume that the population standard deviation is known and decide whether use of the​ z-interval procedure to obtain a confidence interval for the population mean is reasonable. Explain your answer.   The variable under consideration is very close to being normally​ distributed, and the sample size is 10.  Choose the correct answers.   A. It is not reasonable to use the​ z-interval procedure in this case because the sample is too small​ (size less than​ 15).   B. It is reasonable to use the​ z-interval procedure in this case​ since, although the sample is small​ (size less than​ 15), the variable under consideration is very close to being normally distributed.   C. It is not reasonable to use the​ z-interval procedure in this case since it is very likely that with such a small sample size that there will be outliers in the sample. Knowing that the variable under consideration is very close to being normally distributed does not mean the sample is.…

A manufacturer considers his production process to be out of control when defects exceed 3%. In a random sample of 85 items, the defect rate is 5.9% but the manufacturer claims that this is only a sample fluctuation and production is not really out of control. How many populations? 2 1 What is the parameter? Difference between Means Standard Deviation Mean Proportion Variance What is the test statistic?

ANOVA looks at both between subjects and within subjects variance. Looking at variance in one condition (for example, everyone who drank espresso shots) is:   which one below? Within subjects variance Internal variance All variance Between subjects variance