Where are the youngest rocks in the earth’s crust found? near the boundary between ocean crust and continental crust along the continental slope in the center of the continents at the center of the mid-ocean ridge

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.