A set of 10 scores has SS = 90.  If the scores are a sample, the sample variance is ____ and if the scores are a population, the population variance is ____.

Using an independent-measures t, the 90% confidence interval for the difference between two population means ranges from 19 to 23.  Based on this confidence interval, you can conclude that the difference between the two sample means is ____.

In analysis of variance, what is measured by the MS values?

In general, if the variance of the difference scores increases, then what will happen to the value of the t statistic? Hint: variance of the difference score is in the denominator.

If the sample size is held constant, which of the following will produce the widest 90% confidence interval for the population mean difference for a repeated-measures study?

For a negatively skewed distribution with a mode of X = 25 and a median of 20, what is the most likely value for the mean?

Over the course of a semester, eight students take their exams with Essential Oil Blend 1 being diffused in the testing area during Exam 1, Essential Oil Blend 2 during Exam 2, and Essential Oil Blend 3 during Exam 3. What is the dftotal for the ANOVA hypothesis test?

Which of the following is true about correlation?

A sample of n = 9 college students is used to evaluate the effectiveness of a new Study Skills Workshop.  Each student’s grade point average (GPA) is recorded for the semester before the workshop and for the semester after the workshop.  The average GPA improved by MD = 0.60 points with s2 = 0.09.  The researcher would like to use the sample to estimate how much effect the workshop would have for the entire college population.  Which of the following is the 80% confidence interval for these data?

A population of scores has a mean of µ = 26, a median of 23, and a mode of 22.  What is the most likely shape for the population distribution?