Question

Marine scientists categorize signature whistles of bottlenose dolphins by type —type a type b, type c, etc. In one study of a sample of 185 whistles emitted from bottlenose dolphins in captivity, 100

were categorized as type a whistles.

a. Estimate the true proportion of bottlenose dolphin signature whistles that type whistles. Use a

95% confidence interval.

The 95% confidence interval is

(________,________ ). (Round to the nearest hundredth as needed.)

b. Interpret the result. Choose the correct answer below.

A. We are 5% confident that the true proportion of bottlenose dolphin signature whistles that are type a whistle is in interval found in previous step.

B. We are 95% confident that the true proportion of bottlenose dolphin signature whistles that are type a whistles is not in interval found in previous step.

C. We are 100% confident that the true proportion of bottlenose dolphin signature whistles that are type a whistles is in interval found in previous step.

D. We are 95% confident that the true proportion of bottlenose dolphin signature whistles that are type a whistles is in interval found in previous step.

Answer 1