Sample size necessary to estimate a population mean.
Not what you're looking for?
A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate the population mean. What is the minimum sample size needed in order for you to be 99% confident that your estimate is within4 of the population mean. Use the value 23 for the population standard deviation of scores on this subsection.
Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
Purchase this Solution
Solution Summary
This problem shows how to find the sample size necessary to estimate a population mean with a sample mean. The confidence level, a bound on the margin of error, and an estimate of the population standard deviation are given. Using this information, we find the necessary sample size.
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.