The average verbal SAT score for the entire class of entering freshmen is 530.  However, if you select a sample of 20 freshmen and compute their average verbal SAT score you probably will not get exactly 530.  What statistical concept is used to explain the natural difference that exists between a sample mean and the corresponding population mean?

If a repeated-measures study shows a significant difference between two treatments with alpha = .01, then you can be sure that ____.

A professor wants to conduct an independent measures design. He has 5 different treatment conditions and needs n = 20 people for each treatment. How many participants does he need for the experiment?

The following data were obtained from a repeated-measures research study. What is the value of MD for these data?Subject            1st       2nd   #1                  7          16   #2                  6          13   #3                10            8   #4                  9          18   #5                  7          14

A sample of n = 25 scores produces a t statistic of t = 2.062.  If the researcher is using a two-tailed test, then which of the following is the correct statistical decision?

A researcher conducts an experiment to determine whether moderate doses of St. Johns wort have any effect on memory for college students.  For this study, what is the independent variable?

A researcher obtains an F-ratio with df = 3, 12 from an ANOVA for a repeated-measures research study.   How many subjects participated in the research study?

In a two-factor ANOVA, which of the following is not computed directly but rather is found by subtraction?

A researcher is interested in attitudes toward same-sex couples after hearing a persuasive talk about equal rights. Data was collected from 60 participants. Each person completed a survey that measured attitudes toward same-sex couples on a scale of -7 (very negative) to +7 (very positive) before and after the persuasive speech. What test is most appropriate to use to analyze this data?

A sample of n = 4 scores is selected from a population with an unknown mean.  The sample has a mean of M = 40 and a variance of s2 = 16.  Which of the following is the correct 90% confidence interval for µ?