A marine ecologist took a random sample of 100 snails from a

A marine ecologist took a random sample of 100 snails from a rocky intertidal zone and computed a confidence interval to estimate the percentage of snails that belonged to a large bodied highly competitive species. The ecologist felt that the confidence interval was too wide to provide a precise estimate of the population parameter. What could the ecologist have done to produce a narrower confidence interval that would produce a more precise estimate of the percentage of large competitive snails? Question 2 options: a) Increase the sample size to 200 b) Increase the confidence level to 99% c) Both a and b d) None of the above

Solution

Answer: a) Increase the sample size to 200

Increase the confidence level to 99% will widen confidence interval