Ten years ago, only 15% of the U.S. population consisted of people more than 65 years old.  A researcher plans to use a sample of n = 300 people to determine whether the population distribution has changed during the past ten years.  If a chi-square test is used to evaluate the data, what is the expected frequency for the older-than-65 category?

What is not an assumption of an independent samples t test

For the following distribution, what is the width of each class interval?X              f20-24   215-19   510-14   45-9         1

Suppose the correlation between height and weight for adults is +0.40.  What proportion (or percent) of the variability in weight can be explained by the relationship with height?

Find the standard error for a sample mean with n=20 SS= 750

For an independent samples t-test, the null hypothesis states _____.

In a repeated-measures ANOVA, the variability within treatments is divided into two components.  What are they?

Which of these is the ONLY valid null hypothesis listed for a repeated-measures ANOVA?

Which of the following is UNTRUE of z-scores?

Which measure of central tendency will be most affected by an outlier?