The mean yield of wheat from Purulia district was 210 lbs. with S.D 10 lbs. per acre from a sample of 100 plots. In Bankura district, the mean yield was 220 lbs. with S.D 12 lbs. from asample of 150 plots. Assuming that the standard deviation of yield in the entire state was 11 lbs., test whether there is any significant difference between the mean yields of crops in the two distinct. Answers
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