| A | B |
|---|
| people or things described by a data set | individuals |
| any characteristic we observe or measure that takes on different values | variable |
| this type of variable takes numerical vaules (such as height or weight) | quantitative |
| this type of variable classifies an individual into one of several groups or categories (i.e. gender or political party) | categorical |
| the entire big group of people or objects about which we want information | population |
| a smaller group that we actually measure | sample |
| 2 graphs used to display categorical data | bar graph or pie chart |
| graph that displays a frerquency table for numerical data | histogram |
| graph that displays the five-number summary | box plot |
| the average of a list of numbers | mean |
| this number measures the typical amount of sprerad above and below the mean | standard deviation |
| this number has 50% of the measurerments above it and 50% below it | median |
| these numbers separate the bottom 25% and top 25& of the measurements from the middle half | quartile |
| the shape of a graphy in which the left and right halves are approximate mirror images | symmetric |
| if the LEFT half of the graph extends furthe than the right half, the shape is | skewed to the LEFT |
| an unusual value in a list of numbers (much higher or lower than the rrest) | outlier |
| symbol for: sample size | n |
| symbol for: sample mean | x with line above it |
| symbol for:smaple standard deviation | Sx |
