# 4.8 - Com 300 4.8.10 Review Descriptive Statistics Two...

This preview shows pages 1–2. Sign up to view the full content.

Com 300 4.8.10 Review Descriptive Statistics Two Areas: Central tendency and variability/dispersion Notes Centrality: Mean median mode Dispersion: Range Dispersion: refers to the spread of the values around the central tendency 1. The range - subtracting the lowest score from the highest score. a. Example: Test scores high = 98, low = 62 What is the range? 36 -for the most part, a set of data will result in a bell curve when scores or data are plotted. Greek letters you ought to know with statistics Set of scores = X Number of events = n or N Summation = E Arithmetic mean (average) μ = population (MU) m or x = sample mean Standard deviation S = sample standard deviation σ = population standard deviation Dispersion (continued) 2. The standard deviation is a measure of how much scores differ (vary)( from the mean of the scores a. Tells you what your data really looks like using normal distribution principles a.i. Dispersion points closer to the mean = a smaller standard deviation a.ii. Dispersion points or data points far from the mean = larger

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

4.8 - Com 300 4.8.10 Review Descriptive Statistics Two...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online