Describing Numeric Data

Find the median of the following 9 numbers: 43  54  55  63  67  68  69  77  85

• 65
• 64
• 67
• 64.6

Consider the data
43  54  55  63  67  68  69  77  85
Suppose that the last value is actually 115 instead of 85.  What effect would this new maximum have on the median of the data?

• Increase value of the median
• Decrease the value of the median
• Not change the value of the median

Consider the data
43  54  55  63  67  68  69  77  85
Suppose that the last value is actually 115 instead of 85.  What effect would this new maximum have on the mean of the data?

• Increase value of the mean
• Decrease the value of the mean
• Not change the value of the mean

For data on “volumes of milk dispensed into 2-gallon milk cartons,” should you use the mean or the median to describe the center?

• Mean
• median

If the distribution is exactly symmetric, what can be said about the median and the mean of a set of values?

• They are exactly the same
• The mean is larger than the median.
• The mean is smaller than the median.
• Nothing can be said.

For data on “sales prices of homes in Los Angeles,” should you use the mean or the median to describe the center?

• Mean
• Median

For data on “incomes for people in the United States,” should you use the mean or the median to describe the center?

• mean
• median

The five number summary for a set of data is 0, 20, 25, 50, and 110. Is the distribution skewed to the right?

• No
• Yes
• Can't say

The five number summary for a set of data is 0, 20, 25, 50, and 110. What is the IQR?

• 25
• 30
• 50
• 110

The five number summary for a set of data is 0, 20, 25, 50, and 110. Using the 1.5×IQR rule, does the data set contain one or more outliers?

• Yes
• No
• Impossible to say