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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 Type of Hair Mean (N � 0.01 N) Standard Deviation (N) Non-Blow Dried Hair Force 2.08 � 0.68 Blow Dried Hair Force 1.70 � 0.83 Note: Microsoft Excel 2007 was used to calculate mean and standard deviation. Note: Error Bars represent standard deviation. ...read more.


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 t value of 1.99 was used an approximate t value, since a 1.97 value in the 100 degrees of freedom rows does not exist. ...read more.


The average hair breaking force of blow dried hair is 1.70 N � 0.01 N, with a standard deviation of � 0.83. The average of the hair breaking force of non-blow dried hair is greater than the hair breaking force of blow dried hair. This means that blow dried hair is weaker than non-blow dried hair. Since the standard deviation for the non-blow dried hair is less than the standard deviation of the blow dried hair, we are more confident of the accuracy of the non-blow dried hair data, and the blow dried hair data is more variable. ...read more.

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