Purchase Solution

Sample statistics

Not what you're looking for?

Ask Custom Question

A study is run to estimate the mean total cholesterol level in children 2- 6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measures as follows: 185,180,225,240,194,147,196,175 and 223.

a. Compute the sample mean
b. Compute the sample standard deviation
c. Compute the median
d. Compute the first and third quartiles
e. Which measure, the mean or median, is better measure of a typical value?
f. Which measures, the standard deviation or the inter-quartile range, is better measures of dispersion?

Purchase this Solution
Solution Summary

This solution helps estimate sample statistics. It helps compute sample mean, sample standard deviation, median, first and third quartiles. It also explaines which measure, mean or median is a better typical value and whether standard deviation or inter-quartile range is a better measure of dispersion.

Solution Preview

Please see attached files. Thanks for using Brainmass!

To estimate the mean total cholesterol levels of children
A study is run to estimate the mean total cholesterol level in children 2- 6 years of age. A sample of 9 participants is selected ...

Purchase this Solution
Free BrainMass Quizzes
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.

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.

View More Free Quizzes
Related BrainMass Solutions

  • Purpose of selecting a sample. Sample vs. population.

    The sample permits you to get a pretty good idea what the population is thinking, within a small margin of error. How are sample statistics different from population parameters? Sample statistics are estimates of the population parameter.

  • Population & Sample Size Questions

    Test of two populations, small sample size (t-statistics) 4. When would you use two population test with a small sample size in your education? Please see the attached file. Test of single population, small sample size (t-statistics) 1.

  • Calculating Test Statistics and checking claim

    We can say that statistics does not support that μ1 > μ2. The solution describes the steps for calculating test statistics for hypothesis testing based upon two sample statistics.

  • Population Variance of Sample Statistics

    207091 Population Variance of Sample Statistics Use the given sample statistics to test the claim about the difference between two population means μ1 and μ2 at the given level of significance α.

  • hypothesis tests

    Which statistics would you use to compute a confidence interval here? (Z-sigma, Z-s, or t-s) We need to use Z-s, since the sample size is 33, which is larger than 30, the threshold of using z-statistics.

  • Sample Mean, Variance, Standard Deviation and Quartiles

    - Finally use the original table to obtain sample mean, sample variance and sample standard deviation using the Data - Data analysis option selecting Descriptive Statistics and ticking Summary statistics.

  • Average salary of blue-collar workers

    a) Here we have: Sample Size (n) 350 Sample Mean 58596.0981 Sample SD 16595.2246 Sample size (n) = 350, sample mean (x) = 58596.0981 and sample standard deviation (s) = 16595.2246 and population standard deviation (σ) = 22000

  • Test a hypothesis

    120510 Statistics - Perform a two-tailed test. Then fill in the table below. Heights were measured for a random sample of 17 plants grown while being treated with a particular nutrient.

  • descriptive statistics versus inferential statistics

    The findings form the descriptive statistics regarding a sample cannot be generalized because the chosen sample may not be representative of the whole population and hence, inferential statistics is being used wherein the chosen sample is representative

  • parametric and nonparametric hypothesis test

    a) How are parametric and nonparametric statistics different? b) How are parametric and nonparametric statistics similar? A formal hypothesis testing approach can be used for non parametric tests only if the sample size is large ( bigger than 30).

View More Related Solutions