Some of the products from reaction of bromine and propane are shown below.(The hydrogen atoms are not shown in the structures. ) How many are identical structures? 
Definitions:
Degrees Of Freedom
The number of independent values in a statistical calculation that are free to vary when estimating parameters.
Area
A measure of the extent of a surface or a piece of land, often measured in square units.
Chi-squared Distribution
A probability distribution used in hypothesis testing that is derived from the sum of the squares of k independent standard normal random variables.
Critical Value
A threshold in statistical testing that delineates the boundary for rejecting the null hypothesis.
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