33 terms

acute angle

An angle measuring less than 90°

adjacent angles

Two angles that share a vertex and one ray (side).

box plot

A visual way of showing a summary of data using the median, quartiles, and extremes of the data.

complementary angles

Two adjacent angles whose sum measures 90°

construction

The process of using a straightedge and compass to create geometric diagrams.

convenience sample

A subgroup of the population for which it was easy to collect data. (Not randomly selected.)

degree

A unit for measuring angles. Usually denoted by the symbol °

histogram

A way of displaying data that is much like a bar graph in that the height of the bars is proportional to the number of elements. The difference is that each bar of a histogram represents the number of data elements in a range of values

inference

A statistical prediction.

interquartile range

A way to measure the spread of data. It is calculated by subtracting the first quartile from the third quartile: Q3 - Q1

mean

A way of defining the "middle" of a set of numbers. Found by adding the numbers together and then dividing by the amount of numbers in the set.

median

The middle number of an ordered set of data. If there is more than one middle (because there is an even number of data), then find the mean of the two middle numbers.

measure

The act or process of finding a measurement (size or magnitude of a geometric figure).

measure of central tendency

Mean, median, and mode all reflect this statistical measurement regarding the middle is of a set of data.

population

A collection of objects or group of people about whom information is gathered.

protractor

A tool used to measure angles.

obtuse angle

An angle measuring more than 90° but less than 180°

outlier

A number in a set of data that is much larger or much smaller than the other numbers in the set.

quartile

This divides a set of data into four groups of the exact same size.

straight angle

An angle measuring exactly 180°

random sample

A sample chosen as a result of a random process and represents the whole population well.

ray

A part of a line that starts at one point and extends without end in one direction.

representative sample

A subgroup of the population that has the similar characteristic of interest as that of the whole population.

right angle

An angle measuring exactly 90°

supplementary angles

2 adjacent angles whose sum is (adds up to) 180°

vertex

The point of where two rays meet.

vertical angles

2 angles that share a vertex but do not share a side. They are on "opposite" sides and have the same measurement.

voluntary sample

A subgroup of the population that CHOSE to respond to a survey.

minimum

the smallest number in a data set

maximum

the largest number in a data set

range of data

the difference between the maximum and minimum (so take maximum minus minimum)

first quartile (Q1)

the median of the lower half of an ordered set of data (also referred to as the lower quartile)

third quartile (Q3)

the median of the upper half of an ordered set of data (also referred to as the upper quartile)