Question

Environmentalists are concerned that Chinook Salmon are becoming infertile due to the increase of toxic chemicals in the Pacific Ocean. Past studies have estimated that the proportion of Chinook that are infertile is 6%. You randomly and independently collect a sample of 240 Chinook and find that 10% of them are infertile. Is this statistically significant evidence that the past studies are underestimating salmon infertility?

Answer this question by:

1. Calculate and state a 90% confidence interval for the proportion of salmon that are infertile.

2. Briefly interpret your interval.

Answer 1