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March 2, 2015

March 2, 2015

Posted by **Anonymous** on Thursday, December 13, 2007 at 3:16pm.

Wooly Worm Lab • The Chi Square Test:

If the wool pieces are collected randomly, then the number of each color collected should be nearly equal. Thus, a null hypothesis may be proposed that states that there will be no significant difference in the number of each color of yarn collected. If this null hypothesis is not supported by the data, then selection of some colors over others must occur. You use the chi square test to test this null hypothesis by comparing the number of each color of yarn expected to be collected against the number that is actually collected. The chi square value calculated from the formula is a measure of the variation from the expected values. The closer the expected and observed values, the smaller the chi square value will be and the more likely that the data is the result of random choice. Once you get your chi square value, you can use this number to estimate the probability that the null hypothesis is acceptable, i.e. that the wool was collected randomly without color preference. If the null hypothesis is unacceptable then the selection of some colors over others must have occurred. To get the probability look on the chi square distribution chart in the row with the correct degrees of freedom (# of colors

I did that lab above and I am stumped this question:given the current warming trend of our planet, over time (generations of parents and offspring) what do you predict will happen to the species of wooly worms?

- science -
**PsyDAG**, Friday, December 14, 2007 at 12:57pmSee my response to your later post.

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