Question

An environmentalist wants to find out the fraction of oil tankers that have spills each month. Step 1 of 2: Suppose a sample of 733 tankers is drawn. Of these ships, 528 did not have spills. Using the data, estimate the proportion of oil tankers that had spills. Enter your answer as a fraction or a decimal number rounded to three decimal places. Answer(How to Enter) 2 Points # Tables Keypad

Answer 1

Anso- Given n = 733 nos Did not have Spills 528 Had Spills = 733 - 528 Diane 205 Had Spills x a) TO estimate the proportion of oil tankers that had Spills Ô = Х 205 xls = 0.280 733 b) To Construct 95% confidence is terval Ê (1-P CI - þ i z. n 0-280 (1-0-280) СТ 0.280 Iz 733 (z at 95% = 1.96) 0.28010.720) CI - Oo 280 1 1.96 733 CT = 0.280 + 0.033 c T - (0.280 - 0.033, 0. 280 +0.033) C1 = (0.247, 0.313)

Lower end point = 0:247 = 0.313 Upper end point

Hence the solution...