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

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

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

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