A marine biologist is interested in whether the chinook salmon a particular species of salmon in the North Pacific Northwest are getting smaller within the last decade. In a random sample of these...

A marine biologist is interested in whether the chinook salmon a particular species of salmon in the North Pacific Northwest are getting smaller within the last decade. In a random sample of these species of salmon she found the mean length of 36" with the margin of error 9". Construct a confidence interval for the mean of chinook salmon.