Average daily darkness (h) Wildlife-vehicle incidents 10.2 76 10.4 81 10.6 96 11 66 11.2 114 11.8 93 12.3 132 12.5 120 12.8 135 aim 13.2 141 13.3 152 13.5 145 a. Plot the relationship between hours of darkness and number of wildlife-vehicle incidents. Do these data fit the assumptions of correlation? b. What is the correlation between these two vari- ables in the sample? c. What is the 95% confidence interval for the population correlation?

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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.