A Ford F-150 truck is driving on a dirt road and a fast steps out in front of the truck. The truck is moving at 22 m/s and stops in 4.5s. What is the rate of acceleration of the truck?

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.