Measure of Variability and Data Displays

If I use the mean for the center, I will use _________________ for variability.

• Mean Absolute Deviation

• Interquartile Range

Look at the image above. Which measure of variability should you use?

• Mean

• MAD

• IQR

• Median

What is the most appropriate measure of variability?

• range

• median

• mean

• IQR

What is the most appropriate measure of variability and what does it describe in the data set?

• The most appropriate measure of variability is the range. It describes the difference between the fastest and slowest times.

• The most appropriate measure of variability is the IQR. It describes the middle 50% of the fastest and slowest times.

Look at the image above. Which measure of variability should you use?

• Mean

• MAD

• IQR

• Median

What is the variability of the data display?

• High Variability

• Low Variability

• No Variability

Mark recorded her resting pulse rate at different times of the day. Her data is shown and labeled as data set 𝐴. A = {50,50,50,50,52, 52, 52 ,53, 56, 56, 57, 57, 58, 58, 58,60,60,60} Mark added two measurements of her pulse rate during exercise to create the new data set 𝐵, as shown. B = {50,50,50,50,52, 52, 52 ,53, 56, 56, 57, 57, 58, 58, 58,60,60,60,100,122} What measure of variability will be affected the most by the addition of the two new pulse measurements?

• mean

• median

• range

• interquartile range

What is the most appropriate measure of variability for the data?

• Mean

• Median

• Range

• IQR

Which plot has a larger interquartile range?

• Top plot

• Bottom plot

Ervin bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Ervin's scores?

• 193

• 127

• 60

• 66