Here are data on percent change in total mass (in tons) of wildlife in many West African game preserves in years 1971 to 1999:8 Software provides 95% confidence interval for mean annual percent change as 6.66% to 32.55%. There are many reasons why we might not trust interval. (a) Analyze distribution of data. What feature of distribution throws doubt on validity of statistical inference? (b) Plot percents against year. What trend do you see in time series? Describe why trend over time casts doubt on condition that years 1971 to 1999 can be treated as SRS from the larger population of years.