Goal

I can ​select and use appropriate statistical measures.

Vocabulary

​Outlier

a data value that ​is very different from the other values

Example 1: Choose the best measure of center to describe the data set

Gary ​reviews the scores on his weekly quizzes. What measure should he use to get the best sense of how he is doing on his weekly quizzes?

Example 2: Choose the best measure of variability to describe the data set

John and Yoshi are computer lab partners. During a spreadsheet project, ​they decided to enter their French quiz scores on their shared tablet. Choose the best measure of variability for each of the boy's quiz scores.

Try it:

A basketball team's score for a season are: ​44, 43, 42, 40, 42, 45, 39, 38, 18.

a) Find the mean, median, and mode. Which is the best measure?

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b) ​What measure of variability would be the best?

Try it:

Each of five different stores sell a quart of milk for one of the following prices: ​$1.50, $1.55, $1.80, $1.70, $1.50.

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a) What are the mean, median, and mode? ​

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b) Which measure of center ​best describes the data set? Which measure of variability best describes the data set?

Try it:

Using the dot plot:

a) Find the mean, median, and mode.

b) Identify a good measure of variability for this data. Find the value.

Try it:

Using the table:

a) Find the mean, median, and mode for ​Jessie and Sam.

b) What is the best measure of center for Jessie/Sam.

c) What is the best measure of variability for Jessie/Sam. Find the value​