For each of the following scenarios, write research hypotheses in words that are appropriate for a two-tailed single-sample analysis.

1) Comparing a sample of dieters (Bob's dieting group) to a population of dieters (middle-aged men in the US)

2) Comparing a sample flu rate (this past season) to a population flu rate (the past 50 seasons)

3) Comparing a store's monthly cost (this past year) to an overall monthly cost (the past 20 years)