Create an account
The measure of center found by adding the data values and dividing by the total number of data values
Does not vary as much as other measures of center
What is an advantage of using the mean versus other measures of center?
It is more resistant to outliers
What is an advantage to using the median versus other measures of center?
the measure of center that is the middle value when the original data values are arranged in order of increasing or decreasing magnitude. "~ over x = x tilde"
when two data values occur with the same greatest frequency, each one is a mode and the data set is:
When more than two data values occur with the same greatest frequency, each is a mode and the data set is said to be:
A measure of center that is the value midway between the maximum and minimum values in the original data set.
sum of ( frequency * x) / sum of all frequencies
formula for mean from frequency distribution (use class midpoints)
A distribution of data is ___________ if it is not symmetric and extends more to one side than to the other.
Skewed to the left (also called negatively skewed)
Data that has a longer left tail, and the mean and median are to the left of the mode.
Skewed to the right (also called positively skewed)
Data that has a longer right tail, and the mean and median are to the right of the mode
round-off rule for measures of variation
When rounding the value of a measure of variation, carry one more decimal place than is present in the original set of data
Standard Deviation (denoted by s)
The ____ ____ of a set of sample values is a measure of variation of values about the mean.
The _______ of a set of values is a measure of variation equal to the square of the standard deviation.
Range rule of thumb
For many data sets, the vast majority of sample values lie within two standard deviations of the mean. This is called the:
for data sets that are bell shaped, 68% will be within one standard deviation, 95% will be within two deviations, and 99.7% will be within three deviations. This is called the:
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together