AP Stats Test 1 Study Guide copy PDF

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test #1 study guide...

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AP Stats Test #1 Study Guide Univariate Data When asked to describe a distribution of univariate data, talk about… Center- median (50th percentile) or mean When the mean > median, the data is right skewed When the mean < median the data is left skewed Shape- unimotal (mountain shaped), bimotal (two mountains), symmetry, right/left skewed Spread- IQR (Q3 - Q1) and standard deviation 5 number summary: min, Q1, median, Q3, max Outlier if x < Q1 – 1.5(IQR) > Q3 + 1.5(IQR) Normality- a set of data that is essentially symmetric You can tell if a data set is normal if it follows the 68-95-99.7 Rule or if the points on a QQ plot lie close to a linear line 68-95-99.7 Rule- 68% of the data falls between +/- 1 SD away from the mean, 95% of the data falls between +/- 2 SDs away from the mean, 99.7% of the data falls between +/- 3 SDs away from the mean Types of graphs: Dot Plot- place a dot above its value for every observation Frequency

Data

Histogram- a dot plot, but the dots are replaced with boxes Bin width= 0.5

Data

Stem-and-Leaf Plot- a table with the tens digit in the left column, and the ones in the right (each ones digit represents an observation

Histogram if you turn your head sideways!

Bar Chart- used for categorical data, order of bars don’t matter

Box Plots- graph that displays the Q3, Q1, and median of the data with a box (long tail in the right direction  right-skewed, long tail in the left direction  left-skewed)

Bivariate data distribution: Trend- positive or negative Shape- linear, nonlinear, heteroskedastic, homoscedastic Strength- how much prediction power you have with a given x-value (weak, moderately weak, moderate, moderately strong, strong)...