An independent-measures research study uses two samples, each with n = 22, to compare two treatments. If the results are evaluated with a t statistic using a two-tailed test with α = .05, then what are the boundaries for the critical region?

A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment.  Which of the following designs would require only 20 participants?

As standard deviation decreases what happens to standard error (SE)

What is the equation for Cohen’s d and when is it used?

How many participants did I use in my study if I conducted a repeated measures t test and included t(50) in my interpretation?

An advertising company would like to know which of two popular TV shows puts people in the best mood. Participants are randomly assigned to watch one of two TV shows and then completed a questionnaire that assesses mood. The TV shows and mood scores are The Office (M = 16) and Family Guy (M = 24). Higher scores indicate better moods. The ANOVA results are F(1, 149) = 3.42, p < .01. Based on these results, which conclusion is true?

What concept is used to describe a sample?

A professor is using a new teaching method that is supposed to decrease his students’ exam scores. A one-tailed t-test was used. The critical value is 2.75 and the obtained value is 2.23. Which of the following is correct?

Which of the following best describes the possible values for a chi-square statistic?

The average number of hours spent watching Netflix per week in the United States is 20 hours. I randomly sample 10 people and find that my sample mean is 15 hours. What is the parameter?