Check for Understanding: Measures of Spread

One measure of spread is the (a)   . To calculate it, subtract the smallest number from the largest number.

Tags

CCSS.6.SP.A.3

Another measure of spread is the (a)   . To calculate it, subtract the first quartile from the third quartile.

Tags

CCSS.6.SP.B.5C

Which statements are true? Check all.

• The IQR tells us how spread out the "core" of the data is.

• The range is greatly influenced by outliers.

• The IQR is greatly influenced by outliers.

• The range and IQR each only give us info about 2 data values, not the entire set of data.

Tags

CCSS.6.SP.A.3

What is a measure of spread that tells us how spread out all of the data is?

(a)  

Tags

CCSS.6.SP.A.3

Using the data set:

3 4 7 8 10 12 14 18 18 21

What is the range?

(a)  

Tags

CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

Using the data set:

3 4 7 8 10 12 14 18 18 21

What is the IQR?

(a)  

Tags

CCSS.6.SP.B.5C

What is the deviation from the mean for the Astros?

• 0

• 5

• -3

• 3

A teacher looks at a set of test scores from her statistics class. If the test scores have a large variance, what does that tell you about the scores?

• The average score was high.

• The average score was low.

• The scores were very spread out.

• The scores were all close to the mean score.