Introduction to Statistics

Mean

Median

Mode

Mean: "average"

Median: the middle of the data

Mode: Most common (Most Often)

Mean: Add all numbers and divide by how many data points you have.

Median: Order the numbers least to greatest and find the middle. (If there are two, find the mean of these two.)

Mode: Find the data value that occurs most often.

Range

Inter-Quartile Range

Standard Deviation

Range: The distance between the highest and lowest data points.

Inter-Quartile Range: The distance between the lower and upper quartile. 50% of data is here.

Standard Deviation: The average distance from the mean.

Range: Highest - Lowest

Inter-Quartile Range: Q2 - Q1 (Q1 is the middle of the lower half, Q2 is the middle of the upper half)

Standard Deviation: USE DESMOS --> type in the data points in a table --> type stdev(x_1)

Always type the data into a table (click the + button then table)

Mean: mean(x_1)

Median: median(x_1)

SD: stdev(x_1)

Sort a list: sort(x_1)