1. Provide a few examples of situations in which the two samples being studied are related or dependent.
2. Explain how data collection for dependent samples differs from data collection for independent samples.
3. When dealing with statistical inferences for two related populations, what is the key assumption regarding the distribution of the differences of the two populations?
4. Suppose that a nationally known supermarket wishes to compare the sales of its own brand of soft drinks before and after a two-week-long TV promotion. Explain how data could be collected to analyze such dependent samples.