Learning Guide
Difference two groups
This module begins with assumptions necessary for statistical tests. A relationship between statistics and research will be presented. An overview of research design and a beginning introduction of inferential statistics will be presented. The concept of probability of finding differences between two groups will be presented. How to analyze a given data set with two groups and interpret results as a process.
Objectives
This module begins with assumptions necessary for statistical tests. A relationship between statistics and research will be presented. An overview of research design and a beginning introduction of inferential statistics will be presented. The concept of probability of finding differences between two groups will be presented. How to analyze a given data set with two groups and interpret results as a process.
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Readings
Read in textbook Chapter 5 (93-117). The analyses of two groups using at least ordinal data are explained in this chapter. Assumptions are identified for the two tests discussed in this chapter, independent t-test and Mann-Whitney U test.
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Learning Activities
Read in textbook Chapter 5 (93-117). The analyses of two groups using at least ordinal data are explained in this chapter. Assumptions are identified for the two tests discussed in this chapter, independent t-test and Mann-Whitney U test. On your own, answer the Review questions: 1-20 and Critical Thinking questions: 2 & 3. For question 3, instead of using the Appendix in the back of the textbook, use the following link to find the critical value http://www.real-statistics.com/statistics-tables/mann-whitney-table/ . The critical values for n1(n) and n2(m) are provided in the table to determine significance for a two tailed test. First choose the significance level (p value) then follow both sample sizes. The calculated value of U equal to or less than the tabled value. This is reversed compared to most tables that you will/have used. An example could be p = .05, n = 9 and m = 5. The U value would be need to be less than 7. A U value in this example of 7 or less therefore would indicate statistical difference with rejection of the null hypothesis. If your answer to this question is off by 1, do not be concerned. This table is slightly different than the textbook.
Powerpoints. View and/or print the following Powerpoint slides that correspond to the Descriptives Flash movies listed next: Two Groups Part 1, Two Groups Part 2, and Two Groups Part 3. The discussion in this module includes: introduction to research design and methods, validity, process of analysis for two groups including independent t-test and Mann-Whitney U test, confidence intervals, clinical versus statistical differences, hypothesis testing, type errors, power, and sample size.
Movies. View Flash movie links called Two Groups 1, Two Groups 2 and Two Groups 3.
Excel. The following is an Excel workbook file to be used in learning and for assignment completion: Two Groups. Follow the directions and links embedded in Excel developed to guide you through the analysis and interpretation.
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Assignments
Answer the Review questions: 1-20 and Critical Thinking questions: 2 & 3
Use the data below to complete the Two Groups Excel document. Fill in the data and analyses for the Excel document completely.
Participant BDI_SOC BDI_RX
1
21
8
2
21
24
3
35
18
4
21
19
5
23
14
6
16
18
7
21
23
8
29
25
9
23
19
10
30
12
11
28
11
12
15
18
13
28
11
14
14
16
15
23
12
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