Central Tendency

This statistical number is the middle number of the data set.

• Mean
• Median
• Mode
• Range

Kayte took a sample of 50 pieces of data.  She added up all of the pieces of data and then divided by 50.  What measure of center is she working on?

• Mean
• Median
• Mode
• Range

A set of data is given: 3, 7, 11, 11, 16
Jesse calculated a measure of central tendency and got 9.6, which measure of central tendency did he just calculate?

• Mean
• Median
• Mode
• Range

10, 20, 30, 30, 35, 44, 50
If I add 10 to each piece of data to make a new data set,
(20, 30, 40, 40, 45, 54, 60)
which stat calculation will NOT change?

• Mean
• Median
• Mode
• Range

Calculate the median for this set of data
22, 32, 44, 11, 5, 28, 19, 30.

• Median=22
• Median=24.5
• Median=25
• Median=28

Calculate the median for this set of data.
100, 55, 98, 140, 101, 98, 53, 57, 70

• 101
• 100
• 98.5
• 98

Which set of data has a higher mean?
BOB:  1.3, 3.1, 4.1, 2.5, 2.2,  2.8
MEGAN: 5.5, 1.1, 1.2, 2.4, 3.8, 2.0, 1.9

• BOB > MEGAN
• BOB < MEGAN
• BOB=MEGAN

If you have two numbers in the middle, you should

• add them together and divide by two
• find the number in between the two
• find the mean of the two numbers
• all of these

What is an outlier?

• A value that is much less or much greater than the other values in a data set.
• The difference between the upper and lower quartiles of a data set.
• The mean of the distances from each data value in a set to the mean of a set.
• The difference between the greatest and least numbers in a data set.

The mode score on the 9th grade math test was 94! Which of these interpretations must be correct?

• 99 was the highest score on the test.
• More students received a 94 than any other score
• No student scored below a 50
• A score of 91 was slightly below average.