A soft drink company is conducting research to select a new design for the can. A random sample of individuals have been selected to participate. The company gave each participant the same soda twice, but one drink was served in a red can and the other was in a blue can. The order was chosen randomly. Participants were asked to rate each drink on a scale of 1 to 10. Thus the company wishes to test if the colour of the can can influence the ratings. The ratings were recorded in the table below. Does this sample indicate that there is a difference in ratings?

Assume =0.10\alpha=0.10

=0.10

Which of the following statement(s) is(are) true?

This study is a retrospective observational study

This study is an experiment

This study is a prospective observational study