Question

Biologists studying horseshoe crabs want to estimate the percent of crabs in a certain area that are longer than 35 centimeters. The biologists will select a random sample of crabs to measure.

Which of the following is the most appropriate method to use for such an estimate?
A. A one-sample z-interval for a population proportion
B. A one-sample z-interval for a sample proportion
C. A two-sample z-interval for a population proportion
D. A two-sample z-interval for a difference between population proportions
E. A two-sample z-interval for a difference between sample proportions

Answer 1

B. A one-sample z-interval for a sample proportion

Explanation:

In this experiment we are only given the sample. Neither the population nor the two samples nor difference between two samples is given .

So we are left only with the option B which satisfies the required conditions.

We will estimate the sample proportion and then perform, the test.

The test are performed on the basis of the statistics given.

We have the sample and the proportion that it is not longer than 35 centimeters.

Therefore option B is the correct choice.

B. A one-sample z-interval for a sample proportion