Choosing the Best Measures of Center and Variability

How does the outlier in the data set below effect the mean?

• it increases the mean

• it decreases the mean

• it has no effect on the mean

• there is no outlier

What is the mean of the data below?

• 17

• 18

• 20

• 17.5

What is an outlier?

• A value that repeats more than the other values

• The middle value when the numbers are in order least to greatest

• A value that is much less or much greater than the rest of the data

• The difference between the greatest value and the least value in a data set

What is the range of the data below?

100, 42, 120, 42, 30

• 90

• 78

• 58

• 26

What is the definition of the mean?

• The average

• The middle number

• The difference between the highest and lowest numbers

• The number that occurs the most

Find the mean of the following numbers 40, 38, 46, 38, 51 and 57.

• 45

• 40

• 38

• 35

What is another word for average?

• Mean

• Median

• Mode

• Range

What is the first thing you should do before finding the median or the mode?

• Start crossing numbers off

• Put numbers in order from least to greatest

• List the numbers how they are

• Look for repeats

When finding the median, what do you do if there are two middle numbers?

• Add them together and divide by 2

• Write them both as the answer

• Give up

• Pick one

Find the median:
3, 5, 7, 4, 3, 1

• 3 and 4

• There isn't one

• 3.5

• 3