Vocabulary
Qualitative, Quantitative
What does a stem and leaf plot display
distribution
How many equations are there for standard deviation
2, population and sample
Five number summary
minimum, Q1, median, Q3, maximum
What are the measures of center
Mean, mode, median
Four Levels of Measurement
Nominal, Ordinal, Ratio, interval
Line graph represents
data that varies over time
What is the linear equation (Statistically)
y=a+bx
What are percentiles used for
to compare and interpret data
The mean is
the best estimate for the data set
What are the different random sampling methods
simple random sampling, stratified sampling, cluster sampling, and systematic sampling.
Bar graphs show
comparison of data (categorical)
When the data is concentrated to the mean the standard deviation is?
Small, not spread out
How do you calculate IQR
Q3-Q1
The median is better
for when there are outliers
Where does data come from
Sample or population
What kind of graph do you use for frequency distribution.
Histogram
What is variance
average of the squares of the deviations
How much data lies above Q3
75%
What are the different kinds of distribution
left skewed, right skewed, symmetrical
How can we eliminate lurking variables
Use of different treatment groups
What are the different parts you can see in a frequency table
frequency, cumulative frequency, relative frequency, cumulative relative frequency
linear regression for two variables is based on
a linear equation with one independent variable
How do you determine outliers
Q3+IQR(1.5)
Q1-IQR(1.5)
Left skew indicates that the mean
is less than the median