Question

An environmentalist wants to find out the fraction of oil tankers that have spills each month.

Step 1. Suppose a sample of 438 tankers is drawn. Of these ships, 355 did not have spills. Using the data, estimate the proportion of oil tankers that had spills. (Write your answer as a fraction or a decimal number rounded to 3 decimal places) Answer:: ______________

Step 2. Suppose a sample of 438 tankers is drawn. Of these ships, 355 did not have spills. Using the data, construct the 95% confidence interval for the population proportion of oil tankers that have spills each month. (Round your answers to 3 decimal places)Lower Bound: : ______________Upper Bound:: ______________

Answer 1