Statistics Box and Whisker

Which of the following best describes the process of finding the interquartile range for a set of data?

• Add the biggest and smallest numbers.

• Place the numbers in order from least to greatest and find the middle.

• Find the difference between the maximum and the minimum.

• Subtract Q1 from Q3.

The box plot shown represents test scores for a middle school math class. Which statement is NOT supported by the data shown in the box plot?

• The median test score is 80.

• The lower quartile is 65.

• The upper quartile is 90.

• The IQR is 30.

If 44 values were used for the data, about how many data values are greater than the 1st quartile?

• 11
• 22
• 33
• 128

If I want to make sure I have data in the top 50% of plot A, I should make sure to pick a number greater than what amount?

• 14

• 8

• 18

• 22

Which data set shows a greater spread?

• Chess Club

• Checkers Club

• They have the same spread.

• You cannot tell from the box plots.

How do you find the median of a data set?

• Cross out all the large numbers.

• Cross out both sides until you get to the middle.

• Subtract the smallest number from the largest number.

• Cross out the middle numbers until you get to the ends.

When finding the median, what do you do if there are TWO numbers in the middle?

• You write both numbers for your answer.

• You choose the larger number.

• You cross them out-- there is no median.

• You add them together and divide by 2.

What is ALWAYS your first step when given a set of data?

• Put the numbers in order from greatest to least.

• Put the numbers in order from least to greatest.

• Find the median.

• Find the quartiles.

Which group has a greater median shopping time?

• Group A

• Group B

• They're the same.

• You can't tell.

Which group has a smaller interquartile range?

• Group A

• Group B

• They're the same.

• You can't tell.