16299795
Description
| Question | Answer |
| Mean | the sum of all measurements divided by how many measurements there are mean is not resistant to outliers |
| Population mean symbol | |
| Median | cuts the ordered data set into half resistant to outliers if n is odd, then L(M) is a whole number and is an observation if n is even, then L(M) is a fraction and is the average of the ordered observations |
| Range | the difference between the smallest and largest observations not resistant to outliers a measure of the overall spread |
| Variance | a measure of variability about the mean |
| Population Variance | |
| Sample Variance | |
| Sample variance computation steps | |
| Standard Deviation | the difference between the data value and the mean tells us how far things are away from the mean it is the square root of the variance |
| Interquartile Range (IQR) | a measure of dispersion around the median resistant to outliers better measure of spread for skewed distributions IQR - Q3 - Q1 |
| Box Plots | a graphical display which uses several of the numerical measures to give information on symmetry, skewness, spread, outliers 5 number summary |
| Box Plot construction | |
| Independent/explanatory variable (X) | the measurement variable that has no restraints placed on it and that attempts to explain the observed outcomes of another variable - ex. time spent to study for an exam |
| Dependent/response variable (Y) | the measurement variable that measures an outcome of a process that is the effect or consequence of the independent variable ex. exam scores |
| Scatterplot | used to describe the relationship between the independent and dependent variables description includes specifying the direction, form, and strength of relationship |
| Positive Association | if small values of X are associated with small values of Y and large values of X are associated with large values of Y the trend in a scatterplot will be upward sloping |
| Negative Association | if small values of X are associated with large values of Y and vice versa the trend in a scatterplot will be downward sloping |
| Direction | determines the type of association between X and Y upward/downward sloping |
| Form | describes the type of trend in the data |
| Trend | Linear (straight line) Nonlinear (exponential, quadratic) |
| Strength | measures the amount of scatter of a relationship more scatter = weaker relationship less scatter = stronger relationship |
| Contingency Tables | a two way table which describes the relation between two categorical variables data from table can be represented in a bar graph |
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