Atoms of which two elements could combine with atoms of carbon (C) to form covalent bonds?
A. K
B. N
O C. Na
I D. Ca
D E. S

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.