Measures of Center/Measures of Variability

How old is Ms. Lambert?

This is an example of what type of question?

• Statistical

• Non-Statistical

How many pets do the kids in your class have?

This is an example of what type of question?

• Statistical

• Non-Statistical

Ten student's in Ruth's class were asked how many text messages they sent yesterday. Their answers were:

1, 0, 10, 7, 12, 2, 9, 15, 1, 3

What is the MEAN number of texts?

• 6

• 5

• 1

• 15

Ten student's in Ruth's class were asked how many text messages they sent yesterday. Their answers were:

1, 0, 10, 7, 12, 2, 9, 15, 1, 3

What is the MEDIAN number of texts?

• 6

• 5

• 3

• 12

Ten student's in Ruth's class were asked how many text messages they sent yesterday. Their answers were:

1, 0, 10, 7, 12, 2, 9, 15, 1, 3

What is the MODE of the data?

• 2

• 15

• 1

• there is no mode

Frank asked 7 of his friends how many siblings they have. The responses he got were: 1, 6, 2, 4, 4, 3, 8

The mean number of siblings is 4. What is the mean absolute deviation (MAD)?

• 7

• 28

• 12

• about 1.7

How many students are included in the data?

Use the data set of the heights of several different students to find the five number summary.

**DO NOT GO TO THE NEXT QUESTION UNTIL YOU HAVE COMPLETED THE 5-NUMBER SUMMARY

A five number summary consists of the minimum and the maximum number, the mean, and the lower and upper quartiles.

• True

• False

Use your five number summary of the student heights to find the interquartile range (IQR). The IQR is _____?

• 6

• 12

• 48

• 57

Use your 5-number summary (student heights) to find the range of the data. The range of the data is _____?