b) To estimate average water quality of wells, a survey of residential wells was carried out in the rural parts of Avalon. The population of 13,345 wells was identified from assessment records. Three strata were created. The first stratum includes wells in farms with animals, the second stratum includes wells in farms without animals, and the third stratum includes wells in houses. A random sample of wells was selected from each stratum and the water quality was tested for their sodium (Na) concentration (mg/L). tratum Farms with animals Farms without animals Houses Population Sample Size 150 100 250 Size 2,365 1,297 9,683 Sample Mean Na Concentration 237.3 245.6 220.1 Standard Deviation Na Concentration 41.45 37.62 51.23 Find an approximate 95% confidence interval for the average Na difference between the two types of farm wells. Interpret the confidence interval.

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