Purchase Solution

Computer Terminal Reports

Not what you're looking for?

Ask Custom Question

The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years. (Assume these are population values.) A sample of 90 units sold 10 years ago revealed the following distribution of the lengths of life. At the .05 significance level, can the manufacturer conclude that the terminal lives are normally distributed?

Length of life (years) Frequency
Up to 4 7
4 up to 5 14
5 up to 6 25
6 up to 7 22
7 up to 8 16
8 or more 6

Purchase this Solution

Solution Summary

The solution discusses The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years. (Assume these are population values.) A sample of 90 units sold 10 years ago revealed the following distribution of the lengths of life. At the .05 significance level, can the manufacturer conclude that the terminal lives are normally distributed?

Length of life (years) Frequency
Up to 4 7
4 up to 5 14
5 up to 6 25
6 up to 7 22
7 up to 8 16
8 or more 6

Purchase this Solution


Free BrainMass Quizzes
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.

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.