Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Stats Chapter 4
vocab
| Question | Answer |
|---|---|
| distribution | slices up all the possible values of the variable into equal width bins and gives the number of values (or counts) falling into each bin |
| histogram (relative frequency histogram) | uses adjacent bars to show the distribution of a quantitative variable; each bar represents the frequency (or relative frequency) of values falling in each bin |
| gap | a region of the distribution where there are no values |
| stem-and-leaf display | shows quantitative values in a way that sketches the distribution of the data |
| dotplot | graphs a dot for each case against a single axis |
| shape | described by: single vs. multiple modes, symmetry vs skewness, |
| center | the place in the distribution of a variable that you'd point to if you wanted to attempt the impossible by summarizing the entire distribution with a single number (mean and median) |
| spread | a numerical summary of how tightly the values are clustered around the center; IQR, STD DEV |
| mode | a hump or local high point in the shape of the distribution of a variable; apparent location can change as scale of a histogram changes |
| unimodal (bimodal) | having one (two) modes |
| uniform | a distribution that is roughly flat |
| symmetric | a distribution with two halves on either side of the center that look like mirror images of each other |
| tails | are the parts that typically trail off on either side; distributions can be characterized as having long tails or short tails |
| skewed | a distribution that is not symmetric and one tail is longer than the other (skewed LEFT if the tail is longer on the right vice versa) |
| outliers | extreme values that don't appear to belong with the rest of the data; can be unusual values that need more investigation or mistakes |
| median | middle value with half data above and half below; if N is even then it is the average of the two values; usually paired with the IQR |
| range | max - min |
| quartile | lower quartile (Q1): 1/4 data below it; upper quartile (Q3) 1/4 data above it; used with median it divides the data into 4 parts |
| Interquartile Range (IQR) | difference between Q1 and Q3; Q3 - Q1 = IQR; reported along with the median |
| percentile | the ith percentile is the number that falls above i% of the data |
| 5-number Summary | reports the minimum, Q1, median, Q3, and the maximum values |
| mean | average; paired with STDDEV |
| resistant | a calculated summary where outliers have a small effect |
| variance | sum of squared deviations from the mean divided by the count minus 1 |
| standard deviation | square root of the variance; s = sqrt((sigma(y-ybar)^2) / n-1); reported with the mean |
Created by:
697421973
Popular Math sets