Aresearcher wants to know the effect of lighting on snacking behavior. he knows that young adults normally eat an average of = 21 grams of light snack food each day. he selects a random sample of n = 100 adults and places them in a controlled room where lighting is manipulated to mimic mid-day sunlight. bowls of crackers are made available. snack consumption for the sample averages m = 18.7 and s = 9.1. does lighting impact snacking behavior?