Purchase Solution

Sample size required for a particular confidence level

Not what you're looking for?

Ask Custom Question

A machine for making nuts is known to create nuts with a standard deviation in size of 0.20mm. A tradesman is required to adjust the machine to make 49mm nuts. Unfortunately the machines scale is missing and the tradesman has to adjust it by trial and error. How many nuts does he have to make and test after an adjustment before he can be certain at the 95% level of significance that the machine is calibrated to within 0.04mm of the correct size?

Purchase this Solution
Solution Summary

This post explains how to calculate the sample size required for attaining a particular level of confidence level. Explained in detail with formula and calculations.

Solution Preview

This is a sample size determination problem
Tolerance = 0.04mm
Standard ...

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

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.

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

  • Sample size problem set

    This is a set of solutions to six problems all related to finding the minimum sample size necessary to estimate a population parameter with a given maximum allowable error and a given level of confidence.

  • Estimations, Confidence intervals, Sample Size

    Larger the sample size, lesser the margin of error and therefore narrower the confidence interval. Conversely, a level of confidence and an error estimate must be chosen if we want to determine the minimum sample size required for a study.

  • Sample Size/Confidence Interval

    As for a higher level of confidence, z is larger, we conclude that 99% level of confidence requires a larger sample size. The solution examines sample sizes and confidence intervals.

  • US Population Estimation

    Assume a 95% level of confidence. A. How large a sample is needed? b. Assume a 98% confidence level is wanted, what is the required sample size? a.

  • Sample Size, Margin of error

    size required for ± 1%accuracy = 9509 (rounding up) Answer: sample size = 9509 2) Margin of error: 0.007; confidence level: 98%; p and q unknown Sample size (proportions): confidence interval

  • Confidence Interval & Sample Size

    291887 Confidence Interval & Sample Size for a Random Sample 1 (b).

  • Minimum sample size given margin of error

    Use the given margin of error, confidence level, and population standard deviation (o) to find the minimum sample size required to estimate an unknown population means (u) Margin of error: 0.5 inches, confidence level: 90%, o=2.7 inches A confidence

  • Minimum Sample Required in Statistics

    165054 Minimum Sample Required in Statistics 1.) With a margin of error of 0.050; confidence level of 99% ^p and ^q unknown, what is the minimum sample size required to estimate a population proportion or percentage? 2.)

  • Minimum Sample Size Analysis

    a) The minimum sample size required to estimate the population mean with the stated accuracy is _____. (Round to the nearest integer as needed). In this question, the level of confidence is not given.

View More Related Solutions