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Exercise
May 14'23
Answer
Key: A
[[math]]\begin{array}{cc}k & k n_{k} / n_{k-1} \\ 0 & \\ 1 & 0.81 \\ 2 & 0.92 \\ 3 & 1.75 \\ 4 & 2.29 \\ 5 & 2.50 \\ 6 & 3.00\end{array}[[/math]]
Positive slope implies that the negative binomial distribution is a good choice. Alternatively, the sample mean and variance are 1.2262 and 1.9131 respectively. With the variance substantially exceeding the mean, the negative binomial model is again supported.
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