9.44 Seasonal ranges (in hectares) for alligators were monitored on a lake outside Gainesville, Florida, by biologists from the Florida Game and Fish Commission. Six alligators monitored in the spring showed ranges of 8.0, 12.1, 8.1, 18.1, 18.2, and 31.7. Four different alligators monitored in the summer had ranges of 102.0, 81.7, 54.7, and 50.7. Estimate the difference between mean spring and summer ranges on a 95% confidence interval, assuming the data to come from normally distributed populations with common variance.