The number of degrees of freedom used to determine the cut-off sample score from a t table when conducting a t test for independent means is the

Which of the following demonstrate nonverbal behavior that supports the verbal message?

When conducting a t test for independent means

Based on the following results, which would be the correct use of the formula t = (M 1–M 2) /S Difference? Sample 1: Mean = 60; Variance of the distribution of means = 2. Sample 2: Mean = 50; Variance of the distribution of means = 7.

A sports psychologist gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows:Is there a difference in eating habits among professionals in the three sports? (Use the .05 significance level.)a. Use the five steps of hypothesis testing, showing your calculations.b. Sketch the distribution involvedc. Explain results

A school counselor wants to test a technique to reduce procrastination in students. Students time their procrastination for a week, which is used as a pretest indicator of procrastination. Students then attend a workshop in which they are instructed to use a specific warm-up exercise for studying by focusing on a pleasant activity. For the next week, students again time their procrastination. The counselor then uses the time from this week as the posttest (after) measure. Suppose the counselor found the sum of squared deviations from the mean of the sample to be 135 after testing 10 people. What would be the estimated population variance?

A local newspaper reports that young women in a town (i.e., a known population) sleep an average of only 5 hours per night. However, a health psychologist thinks that women in the town who are enrolled in college sleep more than that. The psychologist randomly selects 200 women from the college and asks them to accurately record their hours of sleep, and the women report that they sleep an average of 7 hours per night. What test would the psychologist use to determine whether this mean difference is statistically significant?

In which of the following situations would you use a t test for dependent means?

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A sample has individuals with scores of 1, 3, 5, 6, and 6. What is the estimated population variance?