Compare Variability

Compare the variability of the data for each store.

• The range & IQR are greater at store B as compared to store A.

• There is less variability in prices of DVD players at store A.

• The range & IQR are greater at store A as compared to store B.

• There is more variability in prices of DVD players at store B.

The dot plots show the weights of a random sample of fish from two lakes. Pick the statement that describes the variability of the samples.

• The variability of the weights of the fish in Lake S is greater than the variability of the weights of the fish in Lake R.

• The variability of the weights of the fish in the two lakes are about the same.

• The variability of the weights of the fish in Lake R is greater than the variability of the weights of the fish in Lake S.

• You cannot determine variability based on a dot plot.

One week, Kyasia drove to work. The next week, she rode the train. Each day, she recorded how long it took in minutes. What can Kyasia infer from the two data sets?

• The time it take to get to drive to work is more consistent than the time it takes to take the train.

• Based on the mean, it generally takes longer to take the train to work.

• In terms of time, it is less consistent to drive than it is to take the train to work.

• It's impossible to make any inferences based on the data display.

Which set has greater variability?

• A

• B

Which set has greater variability?

• A

• B

What conclusion can Ms. Long make about the performance of her first- and second-period classes?

• The first-period class had a higher median score than the second-period class.

• The second-period class scores had a higher mean than the first-period class scores.

• The first-period class scores had a greater range than the second-period class scores.

• The second-period class scores had a greater mean absolute deviation than the first-period class scores.

Which measure of variability should you use?

• IQR

• standard deviation

Which measure is the same in both classes?

• Median

• Lower Quartile

• Range

• Interquartile Range

Which measure of center and variability should you use to to compare these data sets? Choose one of each.

• Mean

• Median

• Standard Deviation

• IQR

Which measures of center or variability are greater than 5 degrees? Select three choices.

• the mean of this week’s temperatures

• the mean of last week’s temperatures

• the range of this week’s temperatures

• the mean absolute deviation of this week’s temperatures

• the mean absolute deviation of last week’s temperatures