For the following frequency distribution of exam scores, how many students had scores lower than X = 80?X               f 90-94    385-89    480-84    575-79    270-74    1

A set of n = 30 pairs of scores (X and Yvalues) produces a regression equation of Ŷ = 11X + 13. Find the predicted Y value for an X score of 10.

A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n = 15 students.  However, one of the participants fails to solve the problems so the researcher has an undetermined score.  What is the best measure of central tendency for these data?

What is the mean for the population of scores shown in the frequency distribution table?X    f5    14    23    32    41    2

Fill in the blanks: the independent variable is ______ and the dependent variable is ______.

If all other factors were held constant, how does a large variance affect the t-statistic?

Figure 2.1For the distribution in the accompanying graph, what is the value of ΣX?

A sample with a mean of M = 40 and a variance of s2 = 20 has an estimated standard error of 2 points. How many scores are in the sample?

What is indicated by a large variance for a sample of difference scores?

What are the values for SS and variance for the following sample of n = 3 scores?  Sample:  1, 4, 7  Mean = 4