For the independent-measures t statistic, what is the effect of increasing the sample variances?

A jar contains 10 red marbles and 30 blue marbles.  A random sample of n = 3 marbles is selected from the jar.  If the first two marbles are both blue, what is the probability that the third marble will be red?

A set of n = 5 pairs of X and Y scores has ΣX = 15, ΣY = 5, and ΣXY = 10.  For these data, the value of SP is ____.

In an experimental study:

A sample of n = 4 scores has SS = 60.  What is the variance for this sample?

Which of the following is an accurate definition of a Type I error?

What is the value of (ΣX)2 for the following scores?  Scores: 1, 0, 2, 4

A researcher reports an F-ratio with df = 1, 24 for an independent-measures experiment.  If all the treatments had the same number of participants, then how many individuals were in each treatment?

If SS=5000 for a study that enrolled 51 people, what is the estimated standard error?

Which of the following confidence intervals also indicates a significant difference between treatments with alpha = .05?