Measures of Central Tendency and Variation Flashcards
What is the Mean?
The Mean is the sum of the values in the set divided by the number of values.
What is the Median?
The Median is the middle value or mean of the two middle values when the set is ordered numerically.
What is the Mode?
The Mode is the value or values that occur most often.
What is the Probability Distribution?
The Probability Distribution for an experiment is the function that pairs each outcome with its probability.
What is an Expected Value?
For numerical data, the weighted average of all those outcomes is called the expected value for that experiment.
What is a Weighted Average?
A weighted average is a mean calculated by using frequencies of data values.
What is the Interquartile Range?
The interquartile range, or IQR, is the difference between the 1st and 3rd quartiles, or Q3-Q1. It represents the middle 50% of the data.
How do you find the Interquartile Range in a Box-and-Whisker Plot?
The length of the box in the diagram is the Interquartile Range.
What is the Variance?
The variance is the average of the squared differences from the mean.
What is Standard Deviation?
Standard deviation is the square root of the variance and is one of the most common and useful measures of variation.
What is an Outlier?
An outlier is an extreme value that is much less than or much greater than the other data values. They have a strong effect on the mean and standard deviation.
