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25 Cards in this Set
- Front
- Back
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X bar |
Sample mean/mean |
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Y |
Population mean |
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Equation to find outliers below the data |
Q1-(1.5x × IQR) |
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Equation to find outliers above the data |
Q3+(1.5x × IQR) |
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Equation to find IQR |
Q3-Q1 |
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Steps to draw box plot |
1) draw a line on Q1 2) draw line on median 3) then on Q3 4) draw line to min 5) draw line to # before outlier |
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Standard deviation |
How far apart each # is from the mean |
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SOCS |
shape, outliers, center, spread |
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Sx |
Standard deviation |
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Z score |
Tells us how many deviation from the mean the observation is and in what direction |
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What changes when u add to the data |
Nothing. Not standard deviation not rate of change Mid yes |
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What changes when u multiply ur data |
EVerything expect rate of change |
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Correlation r |
Measures the definition and strength of linear association between two quantitative variables |
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What are the four ways of interpreting |
Direction: positive or negative association Form: linear or non linear Strength: strong moderate weak |
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What is a weak correlation |
-.5 through .5 |
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Moderate correlation |
.5 through .8 or -.5 through -.8 |
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Strong correlation |
.8 through 1 or -.8 through -1 |
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Linear square regression |
Predicts line best fit ( y hat=a+bx) |
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Interpreting LSR |
For every increase in ______ the predicted __________ goes up/down by _________ |
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Residual plots |
Determine if the line is best fit |
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How to find residuals |
Actual - predicted |
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Random sample |
Using a chance process to determine which members of the population are included in the sample |
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Srs |
A method where all have an equal chance |
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Undercover |
When some group of the sample is left out of the process of choosing the sample |
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Mutually exclusive |
No outcome in common |
