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A clinical psychologist is interested in comparing the effectiveness of short term relaxation and cognitive-behavioral therapy in treating mild depression. An experiment is conducted in which 15 patients with mild depression are randomly selected and assigned 5 each to a relaxation therapy group, a cognitive/behavioral therapy group, and an attention placebo group. Therapy is administered until the patient is judged no longer depressed or until 10 treatment sessions have elapsed. The following data is obtained. Scores are the number of sessions for each patient. Cognitive/Behavioral therapy: 5, 6, 8, 4, 7 Relaxation Therapy: 6, 8, 10, 9, 7 Attention-Placebo Therapy Group: 8, 10, 9, 10, 9 Refer to Exhibit 15-2. Fobt = ____. a. 10.21 b. 8.44 c. 8.20 d. 6.88 Refer to Exhibit 15-2. Using a = 0.05, Fcrit = ____. a. 3.98 b. 19.41 c. 6.93 d. 3.88 Refer to Exhibit 15-2. Using a = 0.05, what do you conclude? a. reject H0; there is no difference among the treatments b. reject H0; at least one of the treatments differs from at least one of the others c. retain H0; we cannot conclude that there is a difference among the treatments d. accept H0; we cannot conclude that there is a difference among the treatments Refer to Exhibit 15-2. Estimate the size of the effect ^w^2 = ____. a. 0.5226 b. 0.4824 c. 0.4393 d. 0.4658 The one-way ANOVA partitions the total variability into ____. a. SSW and SSB b. sW 2 and sB 2 c. SSW and SST d. SSB and sB 2
A random variable X that has pmf given by p(x) = 1/ (n+1) over the range Rx = {0,1,2,...,n} is said to have a discrete uniform distribution. Find the mean and variance of this distribution.
According to an Internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is selected at random, find the probability that none of them enjoy drinking beer.
For commercial banks in each state, the U.S. Federal Deposit Insurance Corporation has determined the percentage of domestic assets held by multibank holding companies. Display the distribution as a less-than ogive.
For the 20 test scores shown, find the percentile rank for a score of 86.
Find the probability that among 13 pea offspring; at least 1 pea has a green pod and find the probability that among 8 pea offspring between 2 and 5 have yellow pods.
A local health care company wants to estimate the mean weekly elder day care cost. A sample of 10 facilities shows a mean of $250 per week with a standard deviation of $25. What is the 90 percent confidence interval for the population mean?
Construct the ANOVA table (i.e. compute the between and within SS) and test if there appears to be any differences in means (use α = 0.05)
A carton of 6 batteries contains 2 that are defective and 4 that are good. If we select 3 batteries at random form this carton, what is the probability that the sample contains exactly 1 defective battery?
For each, draw the histogram of the sampling distribution of bar(y). Which sampling distribution has the smaller variance, and why?
A company producing a standard line and a deluxe line of dishwasher has the following time requirements (in minutes) in departments where either model can be processed
Interpret coefficient on log (salesm). If salesm were to be increased by 20%, what would be estimated change in mktgp? Would this effect be substantive?
Using the .01 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution, the cutoff (or cutoffs), and the scor..
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