Vocab
The entire group we want information about
What is the population?
This type of variable is numerical.
What is a quantitative variable?
Every individual has an equal chance at being chosen
What is a simple random sample?
You survey 30 students on how many hours they sleep per night. What is the variable in this context
What is the hours of sleep per night?
A common visual for categorical data.
What is a bar graph?
A number that describes a sample
What is a statistic?
Hair color is an example of this variable.
What is a categorical variable.
Choosing every fifth person on a list
What is a systematic sample?
A histogram has bars increasing in height from left to right. What does this tell you about the distribution?
What is skewed right?
A plot that shows every datât point and distribution
What is a box plot?
The value of a variable for one individual.
What is a data point (or observation)?
The number of pets someone has is this kind of quantitative variable.
What is discrete?
Dividing a population into groups and randomly selecting entire groups.
What is a cluster sample?
If a distribution is symmetric and unimodal, this is the best measure of center to use
What is the mean?
This graph can be misleading if the y axis doesn’t start at zero.
What is a bar graph?
A visual or mathematical summary of data.
What is a distribution?
Height is the type of this quantitative variable.
What is continuous?
Diving a population by category and taking random samples from each
What is a stratified sample?
You’re looking at two boxplots showing test scores from two different classes. One boxplot has a much wider IQR than the other. This tells you what…
What is the class has more variability in test scores?
This error occurs when a survey includes confusing language
What is a wording bias?
The difference between a parameter and a statistic.
What is sampling error?
These variables have a natural order, but the differences between values don't have meaning.
What are ordinal categorical variables?
Asking people outside a store to take a survey
What is a convenience sample?
A stem-and-leaf plot shows a cluster of values around 70, but a single value at 99. 99 is likely to be…
What is an outlier?
This type of study doesn't assign treatments but just observes.
What is an observational study?