Research Methods for Behavioral Sciences - With MindTap
6th Edition
ISBN: 9781337754989
Author: GRAVETTER
Publisher: CENGAGE L
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Chapter 9, Problem 4E
For a within-subjects experiment that includes a time delay between treatment conditions, explain the possible advantages and the disadvantages of increasing the time delay between one treatment and the next.
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Here is the scenario for your Between Subjects Independent One Way ANOVA:
Dr. Xena is interested in determine which type of therapy best helps persons with bipolar depression. She gathers a random and representative sample of men and women ages 18-95 years of age who have a diagnosis of Bipolar Depression who are taking Lithium for at least 6 months. She randomly assigns participants to conditions and measures well being scores after 4 months of therapy. Well being scores range from 0-100, with 100 being high well-being (feel good and experiencing no mood swings). Here is the data:
Cognitive Therapy EMDR Therapy Psychoanalytical Therapy
15 72 28
78 91…
Chapter 9 Solutions
Research Methods for Behavioral Sciences - With MindTap
Ch. 9.1 - Describe the general characteristics of a...Ch. 9.1 - Describe how time-related factors such as history,...Ch. 9.2 - For a within-subjects experiment, explain how the...Ch. 9.2 - Define counterbalancing and explain how it is used...Ch. 9.2 - Describe the limitations of counterbalancing and...Ch. 9.3 - Explain the general advantages and disadvantages...Ch. 9.3 - Define a matched-subject design and explain how it...Ch. 9.4 - Describe the different ways that within-subjects...Ch. 9 - In addition to the key words, you should also be...Ch. 9 - Describe the characteristics of a within-subjects...
Ch. 9 - Time-related factors and order effects can...Ch. 9 - For a within-subjects experiment that includes a...Ch. 9 - Under what circumstances is it advisable to switch...Ch. 9 - Describe the circumstances in which...Ch. 9 - Explain why partial counterbalancing is sometimes...Ch. 9 - Describe the problems that can be caused by...Ch. 9 - A researcher has a sample of 30 rats that are all...Ch. 9 - Explain how a matched-subjects design attempts to...Ch. 9 - Describe the disadvantages of a multiple-treatment...Ch. 9 - At the beginning of this chapter, we described a...
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- What is an experiment?arrow_forwardWhat is an experiment? Give two examples.arrow_forwardHere's a new idea for treating advanced melanoma, the most serious kind of skin cancer: genetically engineer white blood cells to better recognize and destroy cancer cells, then infuse these cells into patients. The subjects in a small initial study were 11 patients whose melanoma had not responded to existing treatments One outcome of this experiment is measured by a test for the presence of cells that trigger an immune response in the body and so may help fight cancer. Here are data for the 11 subjects: counts of active cells per 100,000 cells before and after infusion of the modified cells. The difference (after minus before) is the response variable. Before 17 1 4 4 22 4 1 After 41 11 2 218 22 700 17 532 37 96 108 Difference 24 10 217 18 699 13 510 33 89 107 (a) Explain why this is a matched pairs design. There were an even number of subjects. All of the subjects were related. O Half of the subjects took a placebo. O Each subject was measured before and after treatment. The…arrow_forward
- Two separate samples receive two different treatments. The first treatment group (N = 9) has a mean of 50 with SS = 710. The second treatment group (N = 6) has a mean of 60 with SS = 460. Is the second treatment group significantly larger than the first? What is the effect size?arrow_forwardNormal and special cause variation are managed very differently. How would you know which type you are responding to without the process limits?arrow_forwardHere's a new idea for treating advanced melanoma, the most serious kind of skin cancer: genetically engineer white blood cells to better recognize and destroy cancer cells, then infuse these cells into patients. The subjects in a small initial study were 11 patients whose melanoma had not responded to existing treatments. One outcome of this experiment is measured by a test for the presence of cells that trigger an immune response in the body and so may help fight cancer. Here are data for the 11 subjects: counts of active cells per 100,000 cells before and after infusion of the modified cells. The difference (after minus before) is the response variable. Before 14 24 After 41 10 217 20 701 13 532 39 96 111 Difference 27 216 18 699 508 37 90 107 (a) Explain why this is a matched pairs design. O Half of the subjects took a placebo. O Each subject was measured before and after treatment. O The subjects were paired off with each other. O There were an even number of subjects. O All of the…arrow_forward
- A researcher is testing the effectiveness of an intervention for patients with type 2 diabetes and depression that focuses on increasing medication adherence compared with usual primary care. Patients randomized to the intervention group were more likely to achieve remission of depression compared with patients in the usual care group at 12 weeks (intervention 58.7% vs usual care 30.7%, p < .001). Based on this information and the information found in table 1, how would you interpret the study findings. Table 1. Baseline Characteristics of Study Population Characteristic Sociodemographic Age, mean (SD) y African American, n (%) White, n (%) Hispanic, n (%) Other, n (%) Years with diabetes, mean (SD) MMSE score, mean (SD) Usual Care (n=88) 57.1 (9.6) 48 (54.5) 36 (40.9) 3 (3.4) 1 (1.1) 12.0 (11.8) 28.2 (2.3) Intervention (n=92) 57.8 (9.4) 54 (58.7) 29 (31.5) 4 (4.3) 5 (5.4) 10.5 (1.2) 28.2 (2:3) P value .63 .30 .02 ,99 4 TRA 1arrow_forwardA researcher wants to explore the differences in health effects from two different types of sugar. She hypothesizes that artificial sweetener has lower long term health benefits than natural sugar. She will change her methods this time... This time she will have people consume artificial sweetener for a year and measure their health benefits, and then she will have the same people consume natural sugar for the next year and measure their health benefits that year as well. What type of t-test should she use? Group of answer choices a) Paired Samples b) No answer text provided. c) One sample d) Independent Samplesarrow_forwardThe dose-response effect is best described as When the value of the response variable changes in a meaningful way with the dosage of the suspected cause when similar studies produce similar results when all other possible causes are ruled out when the suspected precedes the response variablearrow_forward
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