Statistics

Q3

Median of the upper half. Also known as UQ.

Q1

Median of the lower half. Also known as LQ.

Q2

Median or middle value of the data set.

Minimum

Lowest value or lower fence of data before it becomes an outlier. Minimum= Q1-1.5(IQR)

Maximum

Highest value or upper fence of data before it becomes an outlier. Maximum= Q3+1.5(IQR)

Equation for IQR

Q3-Q1

What does a larger IQR or standard deviation say about the data?

It is more spread out.

What data are bar graphs often used to display?

Categorical data

What data are histograms often used to display?

Continuous numerical data

X axis displays the…

Independent variable

Y axis displays the…

Dependent variable

The line of best fit is also described as…

Least squares regression line

Interpolation

Involves making predictions inside the range of values shown.

Extrapolation

Involves making predictions outside of the values shown.

Sample of 100 students is a…

Random sample

Sample of 100 students selecting every 12th student from an alphabetical list is a…

Systematic sample

Choosing 25 students from each year level is a…

Stratified sample

Collecting data from the first 25 students in each year level who express interest in completing a survey is a…

Quota sample

Collecting data from the first 100 students to fill out the survey is a…

Convenience sample

Surveying the entire school is a…

Population sample