Purchase Solution

95% confidence interval about the population mean

Not what you're looking for?

Ask Custom Question

The number of hours that a network server was down each month of the previous year is: 4, 4, 5, 1, 5, 1, 1, 2, 1, 2, 1, 2. Place a 95% confidence interval about the population mean number of down hours per month.

My thoughts:
mean = 29 / 12 = 2.4167

mean + Z(0.025) * s/sqrt(n)

mean - Z(0.025) * s/sqrt(n)

Purchase this Solution

Solution Summary

It shows how to calculate the 95% confidence interval about the population mean. A network server for previous years are determined.

Solution Preview

It I correct that mean = 2.417
We need to compute the variance of the sample by:
Var = 1/(N-1)*∑(X-mean)^2 = 2.629
(where N = ...

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.

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.

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.