Ralph and Spencer are both participants in a study examining the effect of adding certified-organic labels on bottled of iced tea.During the study, Ralph saw a bottle of iced tea on which a green "Certified Organic" logo appeared.Spencer saw a bottle of iced tea that didnothave the above logo.

(a)Out of the categories listed below, which term would best describe the group thatRALPHwas assigned to?Explain your choice.

* primary group

*experimental group

* control group

*secondary group

(b)Out of the categories listed below, which term would best describe the group thatSPENCERwas assigned to?Explain your choice.

* primary group

*experimental group

* control group

*secondary group

(c)Suppose this study is a LAB experiment.Would the results be more likely to have INTERNAL or EXTERNAL validity?Explain your answer.