Sophia Introduction to Statistics Unit 5 Milestone 5..

RATIONALE Using the z-chart to construct an 88% CI, this means that there is 6% for each tail. The lower tail would be at 0.06 and the upper tail would be at (1 - 0.06) or 0.94. The closest to 0.94 on the z-table is between 0.9394 and 0.9406. 7/2/2020 Sophia :: Welcome 0.9394 corresponds with a z-score of 1.55. 0.9406 corresponds with a z-score of 1.56. Taking the average of these two scores, we get a z-score of 1.555. CONCEPT Confidence Intervals 3 A market research company conducted a survey to find the level of affluence in a city. They defined the category "affluence" for males earning $100,000 or more annually and for females earning $80,000 or more annually. Out of 267 persons who replied to their survey, 32 are listed under this category. What is the standard error of the sample proportion? Answer choices