Written in APA style/format. Full sentences and no grammatical/spelling errors, please:

1. Define and explain historical research. Explain a situation in which historical research would be appropriate (example).

2. Explain the difference between external and internal evidence and give examples of each.

3. Provide an explanation and an example of the following descriptive research designs:

• Observation studies
• Correlation research

4. Provide an explanation and an example for the following developmental designs"

• Cross-sectional study
• Longitudinal study
• Survey research

5. Provide an explanation and an example of sampling bias.

6. Explain the difference between probability sampling and nonprobability sampling.