# FCS 200 Lecture Notes - Lecture 9: Standard Deviation, Frequency Distribution, Central Tendency

## Document Summary

Types of statistics: two main types, descriptive: quantitative description of data from a sample. Inferential: using data from a sample to make inferences about the population that sample is thought to represent. Describing data: quantitative description of data from a sample. Central tendency: data are complex, even after you provide a visual summary, measures of central tendency provide a single summary of what the typical value is for a variable, mean, median, mode. Mode: the mode in central tendency distribution is the most frequently occurring value, the mode is most often used in nominal data. Median: the median is the numeric value tat separates the bottom from the top half of a distribution. Mean: the mean is the arithmetic average of a distribution, sum values, divide by total number. In must research articles, the mean is used as a summary measure of central tendency: also referred to as average, when data is skewed us the median!