Question

Researchers are interested in mercury content in fish in a river known to collect runoff from a paper manufacturing plant. In particular they are interested in whether the mercury content is higher in Bream or Crappie species. Random samples of 10 Bream and 13 crappie revealed the following levels in parts per million. Construct a 98% confidence interval for the difference in mercury con- centration in these two species. Is there sufficient evidence to justify a difference exists at α = 0.01?

Bream

n1 = 10
x̄1 = 0.022s1 = 0.159

Crappie

n2 = 13
x̄2 = 0.008s2 = 0.008

Answer 1