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Elementary Statistics 1-2 Formulas Flashcards

Terms : Hide Images
1687747269Frequency Distribution1. Classes (must not touch) 2. Tally 3. Frequency0
1687747270Class WidthRange/number of classes1
1687747271Lower Limits (Frequency Distribution)Add class width2
1687747272Upper Limits (Frequency Distribution)Next lower limit - 13
1687747273Midpoint(lower class limit + upper class limit)/ 24
1687747274Relative Frequencyclass frequency/sample size5
1687747275Cumulative FrequencySum of frequencies of that class and all previous classes6
1687747276Class Boundaries in a Frequency HistogramLower limit -.5; Upper limit + .5 (Class boundaries go on the horizontal axis)7
1687747277Sections in the Table for Frequency Distribution1. Class Boundaries 2. Tally 3. Frequency8
1687747278Sections in the Table for Finding Midpoints, Relative Frequencies, and Cumulative Frequencies1. Class Boundaries 2. Frequency (Added together should equal the sample size) 3. Midpoint 4. Relative Frequency (Added together should equal 1) 5. Cumulative Frequency9
1687747279Sections in the Table for a Frequency Histogram/Polygon1. Original Class Boundaries 2. Class Boundaries (.5) 3. Frequency10
1687747280Sections in the Table for a Cumulative Frequency Graph/Ogive1. Upper Class Boundary (.5) 2. Frequency 3. Cumulative Frequency11
1687747281Angle (For a Pie Chart)360 (Relative Frequency)12
1687747282How to Find the Mean of a Frequency Distribution1. 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
1687747283Sections in the Table for the Mean of a Frequency Distribution1. Class midpoint 2. Frequency 3. Class Midpoint x Frequency14
1687747284Finding the Population Variance and Standard Deviation1. 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 deviation15
1687747285Finding the Mean of a Frequency Distribution1. 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
1687747286Sections in the Table for Finding the Mean of a Frequency Distribution1. Class midpoint 2. Frequency 3. Class midpoint x Frequency17
1687747287Coefficient of VariationCV= s/x*100 s=standard deviation x=mean of data entries18
1687747288IQRQ3 - Q119
1687747289Outlier1.5 (IQR) above Q3 or below Q120

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