research stats methods

Use the following data, collected from an independent groups design. a = 0.05. Refer to Exhibit 16-2. The conclusion regarding the main effect of variable A is ____.

If s12 = 9, s22 = 6, s32 = 8, and n1¹ n2¹ n3, then sW2 equals ____.

The HSD test ____.

By doing multiple t tests when there are more than 2 experimental groups we increase the risk of making what kind of mistake?

What is the value of SST if SSB = 236 and SSW = 54?

Exhibit 15-1An investigator conducts an experiment involving the effects of three levels of a drug on memory. Subjects are randomly assigned to one of three conditions. A different drug level is administered in each condition. Memory is measured 10 minutes after each subject receives the drug. The following scores are recorded. The higher the score, the better the memory. Refer to Exhibit 15-1. sB2 = ____.

Exhibit 15-2A 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/BehavioralTherapy

RelaxationTherapy

Attention-PlaceboGroup

56847

  6  810  9  7

  810  910  9

Use the following data, collected from an independent groups design. a = 0.05. Refer to Exhibit 16-2. The value of Fobt for evaluating the row effect is ____.

A major limitation of a two group design is that ____.

Exhibit 16-2Use the following data, collected from an independent groups design. a = 0.05.Refer to Exhibit 16-2. The value of Fcrit for evaluating the column effect is ____.