Purchase Solution

Normal Probability & Margin of Error

Not what you're looking for?

Ask Custom Question

1. A population has a mean of 80 and a standard deviation of 7. A sample of 49 observations will be taken. The probability that the sample mean will be larger than 82 is?

2. With a .95 probability, the sample mean will provide a margin of error of?

Purchase this Solution
Solution Summary

The solution provides step by step method for the calculation of probability using the Z score and margin of error. Formula for the calculation and Interpretations of the results are also included.

Purchase this Solution
Free BrainMass Quizzes
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.

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.

View More Free Quizzes
Related BrainMass Solutions

  • QMTH 205Lab 3:Probability Distribution & Interval Estimation

    The Excel formulas in the protected cells give out values of Z, margin of error, upper limit and lower limit of confidence interval. The solution file is attached. The expert examines probability distribution and interval estimation.

  • Probability Distribution and Possible Outcomes

    The margin of error is 3%. There is not enough reason for Candidate A to rejoice. TRUE. The margin of error shows the amount of random sampling error.

  • Normal distribution and Standard Error of the Mean

    With a .95 probability, how large of a sample needs to be taken to provide a margin of error of 4% or less? 5. a) Solution. Denote the grade of her student by X.

  • Confidence Interval and Random Sample

    As we know that a confidence interval is equal to (sample mean -margin of error, sample mean + margin of error) Hence, the length of the confidence interval is equal to 2*margin of error.

  • Sample size & Normal Probability

    Margin of error 0.04; confidence interval 99%; from a prior study, p is estimated by 0.13. 10. Use the confidence level and sample data to find the margin of error E.

  • Continuous Probability Distributions and Interval Estimation

    Determine the standard error of the mean. standard error of the mean=sigma/sqrt(n)=27/sqrt(81)=3 b. With a 0.95 probability, what can be said about the size of the margin of error? From standard normal table, P(-1.96

  • Universal Credit: How Many Cardholders Should Be Sampled?

    is 0.02 - so alpha/2 is 0.01) z(alpha/2) is the critical value of the normal distribution that leaves a probability alpha/2 at its right sigma is the standard deviation of the population (in your case, 500) E is the margin of error (in your case

  • Probability Problem Set

    510954 Probability Problem Set Problem 3 a. A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80. Determine the 95% confidence interval estimate of the population mean. b.

  • Critical Value and Probabilities

    LA Lakers heights, use the sample in inches 85, 79, 82, 73, 78 5. (1) Find critical value zo/2 that corresponds with the given confidence level of 92% (2) Find the margin of error , assume the sample is used to estimate a population proportion

View More Related Solutions