Graphs
Density Curves
Scatterplot
Sampling and Surveys
Vocab
100
A graph that shows distribution of quantitative variable where the bars are touching
What is a histogram
100
The area underneath the density curve
What is 1
100
A variable that measures the outcome or response of a study
What is a response variable
100
The entire group of individuals we want information about
What is a population
100
When the x variable increases as the y variable increases. Used to measure the strength and direction of the relationship between two variables
What is correlation/association
200
A graph that shows distribution of a quantitative variable. Separate observations into a stem and 1-digit leaf
What is a stem and leaf plot
200
Rule that states that one SD contains 68% of the data, 95% within two SDs, and 99.7% within three SDs
What is the 68-95-99.7 Rule
200
A variable that may help explain or predict changes in a response variable
What is an explanatory variable
200
A subset of individuals in the population from which we actually collect data
What is a sample
200
When one side of the graph is longer than the other side
What is skewed
300
A graph that is used mostly for skewed data, based on five number summaries, spans Q1 to Q3, median marked within box, outliers marked with stars
What is a boxplot
300
Used to tell where someone/something places among the population
What is a percentile
300
A graphed cluster of points each of which represents the values of two quantitative variables
What is a scatterplot
300
A type of sampling where you choose individuals who are easy to reach results from
What is a convenience sample
300
When the left and right sides of the graph are approximately mirror images of each other
What is symmetry
400
A graph that shows distribution of categorical data and adds up to part of a whole
What is a pie chart
400
The equal-areas point which divides the area under the curve in half
What is a median
400
An individual value that falls outside the overall pattern of the relationship
What is an outlier
400
A type of sampling where you use people who chose to respond to a general invitation
What is a voluntary sample
400
Table of counts that organizes the data of two categorical variables
What is a two-way table
500
A graph that shows distribution of a quantitative variable and has values plotted on a number line
What is a dotplot
500
The balance point at which the curve would balance if made of solid material
What is the mean
500
The difference between an observed value of the response variable and the variable predicted by the regression line. All of them add up to equal 0
What is a residual
500
An inactive/fake treatment used in experiments
What is a placebo
500
When a graph has one clear peak
What is unimodal
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