CHAPTER 14 4. A population’s growth rate is the rate minus the rate.
5. When a cause of death is density , a certain proportion of a population dies regardless of the population’s density.
6. A close relationship between two species in which each species provides a benefit to the other is called .

Aresearcher created three groups based on participants bmi: normal weight, overweight and obese. the hypothesis being tested is that the three groups differ in the mean number of artificially sweetened drinks consumed weekly. which statistical test might the researcher use, assuming a reasonably normal distribution of values.