Describing Data
What does SOCS stand for?
Would age be a categorical or quantitative variable?
Quantitative
What's the standard deviation of a normal curve?
1
What do we call the relationship between two variables?
Correlation
What is the formula for residuals?
Observed-expected
How would you find the IQR?
Q3-Q1
What is a graph that displays categorical data
Bar chart, pie chart
What is a z-score?
A variable that determines how many standard deviations you are away from the mean
What does FODS stand for?
Form, outliers, direction, spread
What type of data does a linear regression model show?
Bivariate and quantitative data
What happens when a graph is skewed right?
The mean is higher than the median
What is a graph that displays quantitative data?
How many standard deviations away from the mean is considered unusual?
2
When does correlation equal causation?
Never
What does a negative residual yield?
An overestimation
What measures of spread are not affected by outliers and skewness
Median and IQR
What aspect of categorical data compares distributions to subgroups?
Conditional distribution
What percentage of the data is within 2 standard deviations of the mean on a normal curve?
95%
What do we call data with two quantitative variables?
What does B0 represent in the linear regression equation?
The y-intercept
What do frequency tables do?
They show the distribution of the variable
Which graph/chart/plot of quantitative distribution shows a a 5 number summary rather than every piece of data?
Boxplot
When we add or subtract values to our data, which aspects stay the same?
Measures of spread
What do we call the variable which shows what % of the variation in y can be explained by the variation in x?
Coefficient of determination
How is the equal variance assumption satisfied?
No fan shape in the residual plot