Here are data on the percent change in the total mass (in tons) of wildlife in s

Question

Here are data on the percent change in the total mass (in tons) of wildlife in several West African game preserves in the years 1971 to 1999:

Software gives the 95% confidence interval for the mean annual percent change as ?6.66% to ?2.55%.
There are several reasons why we might not trust this interval.

The distribution has an outlier.

iii)

i) Examine the distribution of the data.
What feature of the distribution throws doubt on the validity of statistical inference? A. The sample is too small. B. There is a lot of variability in the data. C. The distribution is skewed. D.

The distribution has an outlier.

Explanation / Answer

i) B D

ii) C

iii) A

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