summary data for two river basins river A and river B aregiven in the table use

Question

summary data for two river basins river A and river B aregiven in the table use a 90% confidence interval to compare themean values of the two river basins RIVER BASIN      SAMPLESIZE    MEAN    STANDARDDEVIATION A                                  53                  .035                  1.046 B                                   51                    .340                   .960 summary data for two river basins river A and river B aregiven in the table use a 90% confidence interval to compare themean values of the two river basins RIVER BASIN      SAMPLESIZE    MEAN    STANDARDDEVIATION A                                  53                  .035                  1.046 B                                   51                    .340                   .960

Explanation / Answer

Given =0.1, |Z(0.05)|=1.645(check normal table) The 90% CI is (xbar1-xbar2) ± Z*(s1^2/n1 +s2^2/n2) --> (0.035-0.340) ± 1.645*sqrt(1.046^2/53 +0.96^2/51) --> (-0.6287, 0.0187)

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