Unit 1: Exploring One Variable Data Flashcards
“Describe the distribution…” means to write sentences about…
SOCS +C
SOCS +C
Shape, Outliers, Center, Spread, +Context
z-score formula
What’s the shape of this histogram?
skewed right
What’s the shape of this histogram?
skewed left
What’s the shape of this histogram?
symmetric unimodal
What’s the shape of this histogram?
uniform
What’s the shape of this histogram?
symmetric bimodal
What types of displays can be used with categorical variables?
Pie chart, bar graph, segmented bar graph, side-by-side bar graph, mosaic plot
Name the type of variable that only uses names or categories of the data.
Categorical variable
Name the type of variable that is a measurement.
Quantitative variable
What types of displays can be used with one quantitative variable?
stem plot, box plot, histogram, dot plot
What does this symbol represent?
population mean
What does this symbol represent?
Sample mean
What does this symbol represent?
population standard deviation
What does this symbol represent?
sample standard deviation
Measures of center are…
mean or median
Measures of spread are…
standard deviation, IQR, or range
IQR =
Range =
max - min
Definition of standard deviation
The average distance the data strays from the mean
Interpret a z-score
the number of standard deviations above/below the mean
When do you use the mean as the center?
When the distribution is symmetric
When do you use the standard deviation as the spread?
When you have used the mean as the center
When do you use the median as the center?
When the data is skewed or you are working with box plots
When do you use IQR as spread?
When you used the median as center
