## Project Lead The Way - Kentucky

#### Poster Title

The Effect of Time on Orally Contaminated Water Bottles

Secondary School

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-

#### Institution

Project Lead The Way - Kentucky

61

17

#### Abstract

A common topic of discussion in this day and age is the potable of drinking bottled water after it has been exposed to bacteria through consumption. The main purpose of this experiment is to determine how long it takes for bottled water to become dangerous to drink based on amount of bacteria in the water. This is done by taking a drink from a water bottle and leaving them in different temperatures for 7 weeks while taking weekly samples from the bottles and culturing them for 40 hours. The proposed result is that the longer the water bottle sits after being introduced to bacterial, the more bacteria that will accumulate. If further experimentation should be done, the water company and culturing temperature should be taken into account. With an alpha value of .05, degree of freedom of 12, a critical value of 1.782, and a t statistic of 25.8818342. Thus the null hypothesis is rejected and the results are statistically significant.

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COinS

The Effect of Time on Orally Contaminated Water Bottles

A common topic of discussion in this day and age is the potable of drinking bottled water after it has been exposed to bacteria through consumption. The main purpose of this experiment is to determine how long it takes for bottled water to become dangerous to drink based on amount of bacteria in the water. This is done by taking a drink from a water bottle and leaving them in different temperatures for 7 weeks while taking weekly samples from the bottles and culturing them for 40 hours. The proposed result is that the longer the water bottle sits after being introduced to bacterial, the more bacteria that will accumulate. If further experimentation should be done, the water company and culturing temperature should be taken into account. With an alpha value of .05, degree of freedom of 12, a critical value of 1.782, and a t statistic of 25.8818342. Thus the null hypothesis is rejected and the results are statistically significant.