Confidence Intervals 12 Edwin conducted a survey to find the percentage of people in an area who smoked regularly. He defined the label "smoking regularly" for males smoking 30 or more cigarettes in a day and for females smoking 20 or more. Out of 635 persons who took part in the survey, 71 are labeled as people who smoke regularly. What is the standard error for the sample proportion? Answer choices are rounded to the thousandths place. . O 2.778 O 0.112 . O 0.013 2.818 RATIONALE We can note the SE of the proportion is pq n If we note that f = 71 =0.112 , which means 9 = 1-0.112 = 0.888- 635 So if we take all this information we can note SE = 0.112(0.888) = 0.0125 or 0.013- n 635