Researchers wanted to determine the association between number of times one chews food and food consumption. They identified 45 individuals who were 18 to 45 years of age. First, the researchers determined a baseline for number of chews before swallowing food. Next, each participant attended three sessions to eat pizza for lunch until comfortably full by chewing each portion of food 100%, 150%, and 200% of their baseline number of chews before swallowing. Food intake for each of the three chewing treatments was then measured. It was found that food consumption was reduced significantly, by 9.5% and 14.8%, respectively, for the 150% and 200% number of chews compared to the baseline.

(a) What is the research objective of the study?
(b) What is the response variable in this study? Is it quantitative or qualitative?
(c) What is the explanatory variable in this study? Is it quantitative or qualitative?
(d) Who are the experimental units?
(e) How is control used in this study?
(f) Each individual chewed 100%, 150%, and 200% of their baseline number of chews before swallowing. This is referred to as a repeated-measures study since the same participants were exposed to each treatment. The order in which chewing took place (100% versus 150% versus 200%) was determined randomly. Explain why this is important.