The density of a quartz crystal is 2.6 g/cm3. If it is hit with a hammer and breaks into 2 pieces of equal size, what will be the density of each piece? A 2.6 g/cm3
B 5.2 g/cm3
C 1.3 g/cm3
D It is impossible to determine the densities without measuring the mass and volume of each piece separately

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.