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Does more expensive facial cleansers affect the number of pimples on someone's face?

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We measured the amount of pimples on peoples' faces after using the different types of facial cleansers to determine which ones were the most effective.

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We looked at each facial cleansers price to put them in order of least to most expensive ($5, $10, $15, $20) and the time used.

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We found four people (aged 17) and recorded the number of pimples on their faces and assigned them each a cleanser at a different price point to use for two weeks.

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We chose to use a table to represent the data in a more orderly and concise way as I am studying many different items.

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I chose to do a crossover design due to the nature of the study requiring different prices for the study to be accurate. For example, I used 4 different cleansers with 4 different prices and each one had different results and also took place over a period of time so a crossover design was much more fitting than any other.

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There was no need for randomization of groups as there was no way for any personal bias from the researcher to affect the outcome of the data for this experiment. This is also why the experiment did not need to be blinded.

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For this experiment the sample size is 4 different people, all aged 17 years old, with the same number of pimples on their face (20 pimples on each face) over the period of two weeks.

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Margin of error is not included due to the nature of the study having a very small sample size.

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Gather a group of 4 people with the same number of pimples on their face, and record the number of pimples. Have them each take one of the 4 different brands of facial cleansers. Then record the number of pimples on day one of using the facial cleansers and then every four days until two weeks later.

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The standard deviation is 6.27, the study also resulted in the conclusion that the more expensive facial cleansers did more for removal of pimples.