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Consider the question: “Does a traditional classroom SAT preparation course improve scores more than an online study course?”

Design an experiment that could help to answer this question. Refer to problem 9-45 for ideas.

When designing your experiment, make sure you have a sample from each respective population of interest, as well as a sample that gets a 'placebo'.

Ovals with arrows & labeled as follows: Left, 90 car owner volunteers, with 3 arrows, & words, random assignment, each pointing to one of 3 middle ovals, 30 get the new oil, 30 get a typical oil change, & 30 get no oil change, placebo, each oval, has arrow pointing to right oval, Compare Average Gas Mileage of the groups.