Discussion:
PART A: Research Methods and Techniques
In last week we discussed research techniques, this week discussion focuses on the other aspects of research, please pick up one of the following areas and discuss:
1) Different types of bias in research and discuss.
2) Experimental and Non-Experimental Research
3) Distinguishing between a Sample and a Population and then compare at least two sampling methods (e.g. random sampling vs. stratified random sampling or convenience and quota sampling methods?
4) What specific steps would you have taken to obtain a representative sample?
PART B:
Exercise: Determining the sample size and ANOVA
1) Let us consider the question of how large the sample size should be to obtain an estimate of a population proportion at a specified level of precision.
In a survey the planning value for the population proportion p is 0.35.
How large a sample should be taken to provide a 95% confidence interval with a margin of error of 0.05 (Click here to see the Formula).
2) Use the following data and calculate F-test using ANOVA one-way in excel (Click on ANOVA to see an Example in an Excel file) and attach your response or excel file with your post.
You can copy this or download TABLE from here. See more details here LINK)
Table 2: Data for Height for four groups of children <5years
|
ID
|
A
|
B
|
C
|
D
|
|
1
|
60
|
79.2
|
72
|
85.5
|
|
2
|
81
|
95
|
78.2
|
94.5
|
|
3
|
78
|
70.7
|
80
|
57
|
|
4
|
76
|
57.5
|
87
|
71
|
|
5
|
71
|
55.5
|
67
|
67.8
|
|
6
|
67
|
85.3
|
85
|
72.7
|
|
7
|
53.5
|
71.4
|
92
|
75.8
|
|
8
|
45.5
|
63
|
73
|
66.9
|
|
9
|
81
|
95
|
53.5
|
71.4
|
|
10
|
78.2
|
94.5
|
45.5
|
63
|