Statistics - Confidence Interval
Not what you're looking for?
A. Let p equal the proportion of letters mailed in the Netherlands that are delivered the next day. If y= 142 out of a random sample of n=200 letters were delivered the day after they were mailed, find an approximate 95% confidence interval for p.
B. Let p equal the proportion of Americans who favor the death penalty. If a random sample of n= 1234 Americans yielded y=864 who favored the death penalty, find an approximate 95% confidence interval for p.
Purchase this Solution
Solution Summary
A Complete, Neat and Step-by-step Solution is provided.
Solution Preview
(A) p = 142/200 = 0.71, q = 1 - p = 0.29, n = 200
Standard Error, SE = sqrt(pq/n) = sqrt(0.71 * 0.29/200) = 0.0321
Margin of ...
Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.