Chapter 4, Problem 30E

Ozone Ozone levels (in parts per billion, ppb) were recorded at sites in New Jersey monthly between 1926 and 1971. Here are boxplots of the data for each month (over the 46 years), lined up in order (January = 1):

1. a) In what month was the highest ozone level ever recorded?
2. b) Which month has the largest IQR?
3. c) Which month has the smallest range?
4. d) Write a brief comparison of the ozone levels in January and June.
5. e) Write a report on the annual patterns you see in the ozone levels.