Purchase Solution

Standard Deviation: Population Means

Not what you're looking for?

Ask Custom Question

The mean annual family income for 75 people making inquiries at the first development is $150,000.00, with a standard deviation of $40,000.00. A corresponding sample of 120 people at the second development had a mean of $180,000.00 with a standard deviation of $30,000.00. At the .05 significance level, can Jones conclude that the population means are different?

Purchase this Solution
Solution Summary

This Solution contains calculations to aid you in understanding the Solution to these questions.

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.

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.

Measures of Central Tendency

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

View More Free Quizzes
Related BrainMass Solutions

  • What would be the mean, variance, standard deviation and shape of the distribution of sample means?

    Solution: Population standard deviation=square root of population variance=sqrt(5)= 2.2361 Since Population is normally distributed, Mean of sample means distribution=Population Mean=18 Since population is large, Standard deviation of sample

  • Statistics

    Its standard deviation is standard deviation of the population divided by the square root of the sample size.

  • Statistics Multiple Choice

    1. population standard deviation = 5 2. population standard deviation = 10 3. cannot determine from the information given 4. population standard deviation= 1.

  • Role of population standard deviation in hypothesis testing

    Population Standard Deviation Known If the population standard deviation, sigma, is known, then the population mean has a normal distribution, and you will be using the z-score formula for sample means.

  • 13 Probability Statements: True or False?

    If the standard deviation for a population increases, the standard error for sample means from the population will also increase. False as there is no relation between population standard deviation and standard deviation. 13.

  • Hypothesis Testing - Compute the statistical test using the z

    between two means=1.16 Sample standard deviations are used to approximate population standard deviations Null Hypothesis H0: x1=x2 (Population Means are equal) Alternative hypothesis H1: x2 is not equal to x1 (Population means are not equal

  • Z score and T test

    Sample Size 60 Sample Mean 120 Population Standard Deviation 30 Intermediate Calculations Difference in Sample Means -30 Standard Error of the Difference in Means 4.830459 Z-Test Statistic -6.21059 Two-Tailed Test Lower Critical Value

  • Simple Random Sampling

    If 36 women are selected at random, find the mean,μx , and standard deviation, σx, of the population of sample means. Assume that the sampling is done without replacement and use a finite population correction factor.

  • Sample Means and Standard Deviation

    193658 Sample Means and Standard Deviation Suppose the population mean is 50.6 pounds with a population standard deviation of 1.62 pounds. Suppose we take thousands of samples with a sample size of 5. What will the mean of these sample means be?

  • Histogram: Shape of sample; Value of estimate; S.D.

    sample means = population standard deviation/sqrt(sample size) = 27/sqrt 81 = 3.

View More Related Solutions