Statistics Foundations: Chapter 1

Basic statistical measures and types of data visualization based on the lecture notes.

Mean

The value obtained by adding up all the numbers and dividing by the amount of numbers.

Range

The value of the maximum number subtracted by the minimum number.

Median

The middle number of all the numbers laid out in order.

Symmetric graph

A graph type where the mean is used for the data.

Skewed graph

A graph type where the median is used for the data.

Dot plot

A representation of data that has dots. Use this for small data set.

Histogram

A graph used for numbers where the bars are all close together and is quantitative. Use this to see shape, skewness, and outliers

Bar graph

A graph used for categorical data where the bars are spread apart. Use to compare different categories

Skewed right

A distribution where there is more data on the left side and the mean is bigger.

Skewed left

A distribution where there is more data on the right side and the median is bigger.

Frequency

count of how often specific value occurs

Distribution

overall pattern or layout of graph, big picture

Relative Frequency

percentage

stem plot

when you split numbers like 14 becomes 1|4 and you use this to see exact data value and see the overall shape