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Facial expression study. What do people infer from facial expressions of emotion? This was the research question of interest in an article published in the Journal of Nonverbal Behavior (Fall 1996). A sample of 36 introductory psychology students was randomly divided into six groups. Each group was assigned to view one of six slides showing a person making a facial expression.∗ The six expressions were (1) angry, (2) disgusted, (3) fearful, (4) happy, (5) sad, and (6) neutral faces. After viewing the slides, the students rated the degree of dominance they inferred from the facial expression (on a scale ranging from -15 to +15). The data (simulated from summary information provided in the article) are listed in the table.
(a) Conduct an analysis of variance to determine whether the mean dominance ratings differ among the six facial expressions. Use α = .10
(b) Use Tukey's method to rank the dominance rating means of the six facial expressions. (Use an experimentwise error rate of α = .10.)
What is the probability of rejecting the null hypothesis when there are four groups, the sum of the squared treatment effects is 6, the error variance is 3, the group sample sizes are 4, and ε is .01?
Calculate the correlation coefficient between the two variables
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For the hypothesis, H0: µ1 ≤ µ2, a random sample of 10 observations is selected from the first normal population and 8 from the second normal population. What is the number of degrees of freedom
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Using the appropriate statistical table, what is the most accurate statement that can be made about the p-value for the test?
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Ten years ago, an advertising agency took a random sample of 20 personal computer owners who used brands such as Dell, Gateway, Hewlett-Packard, etc. At the time, the agency recorded a satisfaction score, with a maximum of 100 possible points.
the health department reports a 1 rate of the hiv virus for the at-risk population. under certain conditions a
Final step to be performed when testing hypothesis of population mean is to?
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