Comparing Populations

A ______________ is the entire group that we are measuring and learning more about.

• sample

• population

• random

• median

What is the first thing we must do in order to begin finding the median, Q1, Q3, IQR, etc.?

• Order all of the numbers randomly in a scattered order.

• Make all of the numbers have a negative sign.

• Rank all of the numbers in order from least to greatest.

• Take the square root of all of the numbers.

If there is an even number of numbers, there will be ____ middle numbers.

• one

• two

• four

• eight

If there are an odd number of numbers, there will be ____ middle number(s).

• one

• two

• four

• eight

If there are an even number of numbers, with two numbers in the middle, how do we find the median?

• Take the first number to their left, and that is the median.

• Multiply the two middle numbers by each other.

• Add the two middle numbers together.

• Find the number right in the middle of those two numbers (take their average).

The middle number of a set of values is the __________. 50% of the numbers are greater than this number, while the other 50% are less than this number.

• mean

• mode

• median

• range

The ______________ is in the middle of the lower half of a data set. It is also called Q1, the first quartile, or the lower quartile. 25% of the numbers are less than this, while the other 75% are greater than this.

• lower median

• upper median

• IQR

• mean

The ______________ is in the middle of the greater half of a data set. It is also called Q3, the third quartile, or the upper quartile. 75% of the numbers are less than this number, while the other 25% are greater than this number.

• lower median

• IQR

• upper median

• range

The IQR is the difference between the upper median and the lower median. We can also say it equals:

Upper Median - Lower Median

OR

Q3 - Q1

OR

In a box plot, it is the length of the box. It shows how spread out the middle 50% of the numbers are.

• Range

• Mean

• Median

• IQR

The ______________ is the lowest number in the entire population.

• maximum

• quotient

• proportion

• minimum