Breaking Force of Hair Lab

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The Breaking Force of Hair

Data Processing and Presentation

Table #1: Mean and Standard Deviation of Blow Dried Hair and Non-Blow Dried Hair Data

Note: Microsoft Excel 2007 was used to calculate mean and standard deviation.

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Note: Error Bars represent standard deviation. Units and uncertainties are not applicable for the independent variable (type of hair).

Degrees of Freedom

Sum of Samples of Each of the Two Groups – 2

= 50 + 50 – 2

= 98

An approximate value of 100 was used as the degrees of freedom for use in the t-table.

Probability due to chance

Given the t value for the non-blow dried hair compared to the blow dried hair is 1.97, the t-table can be used to find the probability that the difference between the two groups is due to chance. The ...

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