What does an independent-samples t test compare?  

  Within-group variance represents which of the following?  

Consider the following closed-loop unity-feedback system   Where   With a Phase Crossover Frequency (PCF) of 1 rad/s and a Gain Crossover Frequency (GCF) of 1 rad/s The Gain Margin is The Phase Margin is This system is

  The numerator of the independent t test formula represents the  

What does a correlation describe?  

  A draft APA-style Results section reads:“χ² = 6.50 (3, N = 86), p = .012. This means the expected and observed data were the same.” What is the problem with this interpretation?  

  If a one-way ANOVA is statistically significant but η² is very small, what does that suggest?  

  A researcher is investigating whether the average commute time of employees at a company differs from the national average of 30 minutes. The researcher collects a random sample of commute times from employees at the company and conducts a one-sample t test. Which of the following correctly describes the null and alternative hypotheses for this study?  

  A researcher wants to examine whether a mindfulness training program reduces test anxiety in college students. She recruits 40 students and randomly assigns half to a mindfulness training group and the other half to a control group with no training. After four weeks, both groups complete a standardized test anxiety questionnaire. What is the dependent variable in this study?  

  A psychologist conducts a one-sample t test to determine whether the average happiness rating of a sample of retirees (M = 7.5, SD = 1.2, n = 40) is different from the general population’s average happiness rating of 7.0 (on a scale from 1 to 10). The results are: t(39) = 1.82, p = .074, d = 0.29.Based on these results, what should the researcher conclude about statistical significance?