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AP Stat Unit 1
| Term | Definition |
|---|---|
| relative frequency | percentage or decimal that uses the counts (ex. 15/30 = 50%) |
| quantitative | takes on a numerical value, can calculate a meaningful average |
| categorical | labels, categories, can't calculate a meaningful average |
| ways to display categorical data | pie chart, bar graph, mosaic plot |
| frequency | just uses the counts/the number collected from research |
| marginal relative frequency | total from a row/total participants |
| joint relative frequency | total from one box/total participants |
| conditional relative frequency | when question says "given", total from one box/total from a row |
| misleading graphs | have pictures or the y-axis doesn't start at 0 |
| mosaic plot | bars have different widths based on how many people from each group were surveyed (ex. group 1 = 50 people, group 2 = 100 people, the bar for group 2 would be wider) |
| writing about association | 1. yes or no 2. give context with variables/question info 3. use number evidence |
| CSOCS | describes distribution, context, shape, outliers, center, spread; use -ly words like roughly |
| context | use variables/info from the question |
| shape | right skewed, left skewed, symmetric, unimodal, bimodal |
| outliers | greatly affect mean, # < Q1-1.5(IQR), # > Q3+1.5(IQR) |
| center | mean (symmetric with no outliers) or median (skewed with outliers) |
| spread | range, standard deviation (symmetric), interquartile range (skewed) |
| discrete data | no decimals, countable whole numbers |
| continuous data | infinite values, can have decimals, measurements |
| ways to display quantitative data | dot plot, stem plot, histogram, box plot |
| if a graph is symmetric... | the mean and median are almost the same |
| boxplots | outlier isn't connected, box starts at Q1 and ends at Q3, median is a line inside the box, min and max are points and connected with lines to the box, box contains 50% of the data |
| comparing boxplots | use CSOCS and comparative language (higher/lower) with evidence (numbers on graph) |
| Q1 | median of the first half of data (data before the median of the data set) |
| Q3 | median of the second half of data (data after the median of the data set) |
| IQR | Q3-Q1, skewed graph |
| 5 number summary | minimum, Q1, median, Q3, maximum |
| standard deviation | the average distance points are from the mean, symmetric graph |
| interpret the standard deviation | the (context/variables) typically vary from (mean) by (standard deviation) |
| left skewed | mean < median |
| right skewed | mean > median |
Created by:
ts2819
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