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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
Assuming that an IP packet has a maximum 900 byte payload, determine the following. What is the probability that a file transfer requires more than 10 packets? repeat for 100 or more?
What is the probability that a randomly selected player bats over 0.300? What is the probability that a team of 25 players has a mean that is above 0.275?
What percent of the sales representatives earn more than $42,000 per year? What percent of the sales representatives earn between $32,000 and $42,000?
Identical parts of which 10 are defective and 90 are non-defective. Three parts are selected without replacement. What is the probability that at least one part is defective?
Find the number z such that 22% of all of observations that are less than z in a standard observations from a standard normal normal distribution is 0.98.
A contractor is considering a sale that promises a profit of $31,000 with a probability of 0.7 or a loss (due to bad weather, strikes, and such) of $13,000 with a probability of 0.3. What is the expected profit?
According to the data from the College Entrance Examination Board, scores on the SAT-I test have a mean of 1017, and Q1 is 880.
How much time should be allowed if we wish to ensure that at least 9 out of 10 students (on average) can complete it? (round to the nearest minute).
Find out the probability that at least one of the CD's is defective?
Formulate a hypothesis statement and perform the five-step hypothesis testing procedure on the data identified.
Find the margin of error for the values of c,s,and n and construct the confidence interval to find the estimated margin of error. Then find the sample mean.
The means appear to be very close, but not the variances. (a) At α = .05, is there a difference in variances? (b) Show all steps clearly, including an illustration of the decision rule.
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