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In the following study, participants were randomly assigned to receive humanistic therapy, psychodynamic therapy, or behavioral therapy for their depression. Six months after therapy ended, participants' levels of depression were rated on a Likert scale from 1 (not at all depressed) to 15 (extremely depressed). GROUP N MEAN STD DEV STD ERROR 1 (Humanistic) 10 5.40 2.17 0.69 2 (Psychodynamic) 10 7.50 2.84 0.90 3 (Behavioral) 10 5.60 3.13 0.99 ONEWAY ANOVA: THERAPY by DEPRESSION SUM OF MEAN SOURCE SQUARES DF SQUARES F RATIO PROB. BETWEEN GROUPS 26.87 2 13.73 1.78 .187 WITHIN GROUPS 203.30 27 7.53 TOTAL 230.17 29 POST HOC TEST: Tukey-HSD with significance level .05 * in a cell indicates significant differences shown for pairings GROUPS 1 (5.40) 2 (7.50) 3 (5.60) 1 (5.40) 2 (7.50) 3 (5.60) a. Describe the design of this study and explain how you know this. b. Identify the independent and dependent variables, and name the scales of measurement for each. c. What kind of inferential analysis was conducted? d. Did the independent variable have a significant effect on the dependent variable? How do you know? e. Write a complete APA-format conclusion for these results.
An analysis of variance was used to evaluate the mean differences from a repeated-measures research study. The results were reported as F(3,24)=6.40.
A simple random sample of 50 items from a population with σ 6 resulted in a sample mean of 32.
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
The F test is used in Analysis of Variance (ANOVA). When would a researcher use an ANOVA? Explain (one paragraph in length).
Here is a fictitious example: Say your review of the literature shows that we know that smiling causes happiness. It also shows that there is disagreement among researchers and theorists in these areas.
Steve Goodman, production foreman for the Florida Gold Fruit Company, estimates that the average sale of oranges is 4,700 and the standard deviation is 500 oranges. Sales follow a normal distribution.
For a sample of 20 stations last Tuesday the correlation was .78. At the .01 significance level is the correlation in the population greater than 0? t= .78-20.00/.01SQRT 20=?
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
Student record revealed that 16 out of a random sample of 64 of student with loans. It supposed that current rate is persisting across all students. Compute probability that number of students with loans will be less than 375.
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
How many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
Find a 90% confidence interval for the population mean weight of all such turtles.
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