Changed logistic model code to match description #50
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- In the final exercise, in the exponent of the exponential, the parameter `a` is multiplying the other term - However, in the accompanying code, the parameter `a` is dividing it - The accompanying Wikipedia link about Item Response Theory also uses the convention of multiplying in the factor `a` - Easy fix: in the code switch `a` from `a = 100` to `a = 1 / 100`, and switch it it multiplication in the assignment to `x` - Closes AllenDowney#49
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parameter
ais multiplying the other termais dividing itthe convention of multiplying in the factor
aafroma = 100toa = 1 / 100, andswitch it to multiplication in the assignment to
x