Chapter 5, Problem 20E

a)

To determine

To find which month have highest ozone level ever recorded.

Answer to Problem 20E

April.

Explanation of Solution

Given:

  

There is outlier in April which is highest ozone level. Hence, April month having highest ozone level.

b)

To determine

To find which month have largest IQR.

Answer to Problem 20E

February month have largest IQR.

Explanation of Solution

Given:

  

The height of the box is largest for February month. Hence, February having largest IQR.

c)

To determine

To find which month have smallest range.

Answer to Problem 20E

August having smallest range.

Explanation of Solution

Given:

  

The distance between the whiskers is small then we supposed that month having smallest range. Therefore, August month have smallest range.

d)

To determine

To compare January and June ozone level.

Answer to Problem 20E

The center of ozone level in both months are same. But the spread of ozone level in January is more than June.

Explanation of Solution

Given:

  

The center of ozone level in both months are same. But the spread of ozone level in January is more than June.

e)

To determine

To write a report on annual pattern of ozone levels.

Explanation of Solution

Given:

  

The center of ozone level in both months are same. But the spread of ozone level in January is more than June. The distance between the whiskers is small then we supposed that month having smallest range. Therefore, August month have smallest range. Therefore, the ozone levels seem to be higher at the beginning of the year than at the end of the year. They are highest in March and April, while lowest in October.