Confidence Interval
Not what you're looking for?
In an election campaign, the party vying for an upset polls a sample of 100 voters. The party finds that 60 of 100 clearly express the intention of voting in favor of the party polling.
How many voters should be sampled if the party wants to estimate the population proportion with a sampling error of 5% or less? (Use confidence level of 95%)
Purchase this Solution
Solution Summary
Step-by-step computation of a confidence interval.
Solution Preview
1. How many voters should be sampled if the party wants to estimate the population proportion with a sampling error of 5% or less? (Use confidence level of 95%)
I will use ^ for the squared sign. First, we need to determine the standard deviation of the voters' ratings (usually given or we would have to calculate from the raw data which is not provided here) to complete the equation to determine the final estimate and sample size. For now, then, we will use x = standard deviation (sigma represented by the symbol σ).
In this problem, the election campaign desires to ...
Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
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.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
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.