Stratified Sampling
A visual representation of selecting a random sample using the stratified sampling technique
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Describe the assumptions on which non-parametric tests are based.
Stratified Sampling
Compute product moment correlation of the following data:
| X: | 45, | 55, | 56, | 58, | 69, | 65, | 68, | 78, | 75, | 80, | 85 |
| Y: | 56, | 50, | 48, | 60, | 62, | 64, | 65, | 70, | 74, | 83, | 94 |
What is contingency table? What is its use in epidemiological studies?
What are the various types of graphs commonly used for representing frequency distribution? How are they different from each other?
Community trial
A child psychologist believes that children perform better on tests when they are given perceived freedom of choice. To test this belief, the psychologist carried out an experiment in which 200 third graders were randomly assigned to two groups; A and B. Each child was given the freedom to choose a text booklet from many with various drawings on the covers. The performance of each child was rated as very good, good and fair. The results are summarized in table provided. Test using chi-square whether there is sufficient evidence in the data to support the psychologist’s belief:
