20 crossroads were watched for weeks, 10 roundabouts and 10 plain intersections with 4 way stop signs, assume equal traffic for each. • 7 roundabouts had fender benders (1 each), 3 intersections had fender benders (1 each). • Write out the full hypergeometric expressions for fishers exact test to determine whether there is a difference in safety (1 sided), and calculate the P value. (You can use R fisher.test for the calculation, but write out how it is doing the calculation).

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