Which of the following statements is true?
a) earth is the only planet with an atmosphere
b) earth's atmosphere changed to an oxygen-rich one
c) earth's formation was different from other planets
d) earth does not change

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.