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Picturing Distributions with Graphs
Describing Distributions with Numbers
Normal Distribution
Scatterplots
Regression
100
Any characteristic of an individual
What is a variable
100
The value that comes up the most in a data set
What is the mode?
100
A symmetric, single-peaked, bell shaped histogram
What is a normal curve?
100
A variable that may explain or influence changes in a response variable
What is an explanatory variable?
100

The use of a regression line for prediction of values of the explanatory variable far outside the range of the data from which the line was calculated

What is extrapolation?

200
A variable that places an individual into once of several groups or categories
What is a categorical variable?
200
The median of the following numbers: 18, 23, 25, 38, 96, 182, 183
What is 38?
200
When a histogram has two peaks
What is bi-modal?
200
The axis the response variable should go on
What is the Y axis?
200

The distance between the data points and the regression line.

What are residuals?

300
An individual value that falls outside the overall pattern
What is an outlier?
300
The five values that make up a five number summary
What are minimum, Q1, median, Q3, and maximum?
300
The value that controls the spread of a normal curve
What is the standard deviation?
300
The measurement of how strong the linear relationship of variables is.
What is correlation?
300
Variables outside of the experiment that could affect data
What are lurking variables?
400
When the right side of the histogram extends much father than the left
What is right skewed?
400
The ______ is sensitive to outliers, but the _______ is not
What is mean, median?
400
When the mean of a density curve is to the left of the median
What is left-skewed?
400

This tells us how the predicted y-variable changes as the x-variable increases by 1

What is slope?

400
The straight line that minimizes the sum of the squares of the vertical distances of the observed points from the line
What is the least-squares regression line?
500
A graph that represents the frequency categorical variables come up as percentages
What is a pie chart?
500
The Q3 of this number set: 22, 25, 27, 34, 40, 48, 49, 55, 59, 68, 88, 95, 152,
What is 78?
500
The formula for z-score
What is (x-mean)/standard deviation?
500
When r= 1 or -1
What is perfect correlation?
500

The % of variation in the y-values that is explained by the variation in the x-values

What is R2