Chapter 2 descriptive statistics pdf

What is 2 descriptive statistics?

Descriptive statistics are broken down into measures of central tendency and measures of variability (spread).
Measures of central tendency include the mean, median, and mode, while measures of variability include standard deviation, variance, minimum and maximum variables, kurtosis, and skewness..

How do you summarize data?

1. Mean (average) – Sum of all individual values (Σxi) divided by total number of values in sample/population (n).
This is the most commonly used measure of central tendency under symmetrical (normal) distribution.
2. Median – The middle value when the data set is ordered in sequential rank