Purchase Solution

Ratio of two population variance

Not what you're looking for?

Ask Custom Question

A manufacturer needs to compare the weights of a product produced at 2 different plants. A random sample of 16 items from Plant A has a standard deviation of 12 milligrams and random sample of 25 items from Plant B has a standard deviation of 15 milligrams. Assuming that both populations are normally distributed, construct a 99% confidence interval for the ratio of the two population variances.

Purchase this Solution
Solution Summary

The expert examines the ratio of two populations variance.

Solution Preview

A manufacturer needs to compare the weights of a product produced at 2 different plants. A random sample of 16 items from Plant A has a standard deviation of 12 milligrams and random ...

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.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

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.

View More Free Quizzes
Related BrainMass Solutions

  • Confidence interval for the ratio of population variances

    242479 Confidence interval for the ratio of population variances Confidence interval for the ratio of population variances Actuaries use various parameters when evaluating the cost of a life insurance policy.

  • Two Way ANOVA: Gender, Marital Status, and Happiness

    The F ratio for gender is the mean square of gender divided by mean square of error or within variance. Thus, F ratio for gender = 68.15/9.299=7.33 2.

  • Analysis of Variance - ANOVA Problem

    We actually do this by estimating a combined population variance two different ways and comparing the two estimates (the ratio of these two variance estimates follows the so-called "F distribution").

  • Analysis of variance (ANOVA) interpretation

    4) What are two sources of variation that can contribute to the between-groups population variance estimate?

  • Multiple choice questions on ANOVA

    The F-ratio for an analysis of variance comparing two treatments with n = 10 in each treatment would have df = 2, 18. True False 7.

  • Minimum sample size

    The ratio of (population standard deviation-square)/(precision level-square) = population variance/(precision level-squared) = Hence sample size n = (z-squared)/(0.4)^2 = (1.96)^2/0.16 = 24.01 = 25 Solution contains calculation of minimum sample

  • MCQs: ANOVA

    * there are no differences between any of the population mean When comparing more than 2 treatment means, why should you use an analysis of variance instead of using several t tests?

  • The answer to Nonparametric tests

    One way analysis of variance (F test) Kruskal-Wallis analysis of variance by ranks Compares three or more groups Two way analysis of variance Friedman Two way analysis of variance Compares groups classified by two different factors A 300-words writeup

  • Statistics - Nonparametric, Tests

    One way analysis of variance (F test) Kruskal-Wallis analysis of variance by ranks Compares three or more groups Two way analysis of variance Friedman Two way analysis of variance Compares groups classified by two different factors This solution contains

View More Related Solutions