Difference between a random sample-a representative sample

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Assignment:

UEL-DS-7006 Quantitative Data Analysis (QDA)

FORMATIVE ASSESSMENT

1. What is the difference between a random sample and a representative sample?

2. Why might a strati?ed sample be superior to a simple random sample?

3. In what context might multistage cluster sampling be particularly useful?

4. If a sample of grocery shops were selected randomly from the Yellow Pages in your town, would you necessarily have a representative sample?

5. A researcher develops a new multiple-item measure of 'politieal conservatism". Hefshe administers the measure to a sample of individuals and also asks them how they voted at the last general election in order to validate the new measure. The researcher relates respondents' scores to how they voted. Which of the following is the researcher assessing:

(a) the measurc's concurrent validity;

(b) the measurc's predictive validity; or

Reference no: EM134020758

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