Elementary Statistics 1-2 Formulas Flashcards
Terms : Hide Images [1]
| 1687747269 | Frequency Distribution | 1. Classes (must not touch) 2. Tally 3. Frequency | 0 | |
| 1687747270 | Class Width | Range/number of classes | 1 | |
| 1687747271 | Lower Limits (Frequency Distribution) | Add class width | 2 | |
| 1687747272 | Upper Limits (Frequency Distribution) | Next lower limit - 1 | 3 | |
| 1687747273 | Midpoint | (lower class limit + upper class limit)/ 2 | 4 | |
| 1687747274 | Relative Frequency | class frequency/sample size | 5 | |
| 1687747275 | Cumulative Frequency | Sum of frequencies of that class and all previous classes | 6 | |
| 1687747276 | Class Boundaries in a Frequency Histogram | Lower limit -.5; Upper limit + .5 (Class boundaries go on the horizontal axis) | 7 | |
| 1687747277 | Sections in the Table for Frequency Distribution | 1. Class Boundaries 2. Tally 3. Frequency | 8 | |
| 1687747278 | Sections in the Table for Finding Midpoints, Relative Frequencies, and Cumulative Frequencies | 1. Class Boundaries 2. Frequency (Added together should equal the sample size) 3. Midpoint 4. Relative Frequency (Added together should equal 1) 5. Cumulative Frequency | 9 | |
| 1687747279 | Sections in the Table for a Frequency Histogram/Polygon | 1. Original Class Boundaries 2. Class Boundaries (.5) 3. Frequency | 10 | |
| 1687747280 | Sections in the Table for a Cumulative Frequency Graph/Ogive | 1. Upper Class Boundary (.5) 2. Frequency 3. Cumulative Frequency | 11 | |
| 1687747281 | Angle (For a Pie Chart) | 360 (Relative Frequency) | 12 | |
| 1687747282 | How to Find the Mean of a Frequency Distribution | 1. Find the midpoint of each class 2. Find the sum of the products of the midpoints and their frequencies 3. Find the sum of the frequencies 4. Find the mean of the frequency distribution (divide by sample size) | 13 | |
| 1687747283 | Sections in the Table for the Mean of a Frequency Distribution | 1. Class midpoint 2. Frequency 3. Class Midpoint x Frequency | 14 | |
| 1687747284 | Finding the Population Variance and Standard Deviation | 1. Find the mean of the population data set 2. Find the deviation of each entry (data entry - mean) 3. Square each deviation 4. Add them all together to get the sum of squares 5. Divide by number of data entries to get population variance 6. Find the square root of the variance to get the population standard deviation | 15 | |
| 1687747285 | Finding the Mean of a Frequency Distribution | 1. Find the midpoint of each class 2. Find the sum of the products of the midpoints and the frequencies 3. Find the sum of the frequencies 4. Find the mean of the frequency distribution (Divide #2 over #3) | 16 | |
| 1687747286 | Sections in the Table for Finding the Mean of a Frequency Distribution | 1. Class midpoint 2. Frequency 3. Class midpoint x Frequency | 17 | |
| 1687747287 | Coefficient of Variation | CV= s/x*100 s=standard deviation x=mean of data entries | 18 | |
| 1687747288 | IQR | Q3 - Q1 | 19 | |
| 1687747289 | Outlier | 1.5 (IQR) above Q3 or below Q1 | 20 |