The following data are the maximum daily ozone concentrations for the months indicated. Graph the data in a way that will emphasize the monthly variation in the concentration. Also, graph the data in a way that emphasizes the annual variation. Does the effect of monthly variation make it more difficult to assess the importance of the annual variation? Explain.

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Year February April June August October December 1980 61 1981 63 1982 64 1983 68 1984 74 1985 73 1986 67 1987 66 1988 62 1989 59 1990 56 22222222333 72 77 83 64 55 71 78 87 66 58 72 78 86 66 59 72 80 89 72 63 73 85 94 68 66 74 86 92 70 64 73 85 90 67 64 72 83 86 63 59 68 81 87 65 57 66 82 86 62 51 65 80 86 60 50