Purchase Solution

Confidence Interval

Not what you're looking for?

Ask Custom Question

A journal article reports that a sample of size 5 was used as a basis for calculating a 95% confidence interval for the true average natural frequency (Hz) of delaminated beams of a certain type. The resulting interval was [216.3, 217.8]
You decide that a confidence level of 99% is more appropriate than the 95% level used. Hint: Use the center of the interval and its width to determine the mean and standard error.

a) What is the lower limits of the 99% interval? Give your answers to three decimal places.

b) What is the upper limit of the 99% interval? Give your answers to three decimal places

Purchase this Solution

Solution Summary

The expert calculates the confidence interval. Upper and lower limits are provided.

Solution Preview

A journal article reports that a sample of size 5 was used as a basis for calculating a 95% confidence interval for the true average natural frequency (Hz) of delaminated beams of a certain type. The resulting interval was [216.3, 217.8] . You decide that a confidence level of 99% is more appropriate than the 95% level used. Hint: Use the center of the interval and its width to determine the mean and standard error.

What is the lower limits of the 99% interval? Give your ...

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.

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.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.