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our results were published on car magazines to show how efficient cars run on chicken grease

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We randomized all 30 subjects. the results are statistically significant since there is a difference of -5.3

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We will replicate this study with 30 new subjects, at a different mechanic shop to confirm that the results are valid

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Our sample size/ M0E is 18.25, since this is a larger sample size the margin of error will be smaller.

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We have will have two different.groups one group being the one that doesn't have chicken grease in their car and the second group being the one that does have chicken grease in their car.
this will help us see which car runs better.

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We do not have a blind because the people are aware that the chicken grease in in their car.

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Control: People who don't have chicken grease in their car.

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We went to a local mechanic shop and asked to see a list of oil changes in the past month. we numbered people one to 30 for the treatment group. potential lurking variables are how far someone drives, the type of car, driving habits.

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In 3000 miles we will check the valve covers of the 30 cars and see which worked better, the oil or the chicken grease

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Which treatment each unit received with or without chicken grease

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15 people will be asked to have chicken grease substitute instead of oil and 15 people will receive regular oil

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We went to a mechanic shop and asked to see a list of the last 30 people who got an oil change.

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Is chicken grease a better alternative for oil in your car?