The R data set airquality contains daily ozone mea-surements, temperature, wind, solar radiation, month, and day. Use the command pairs(airquality[1:5]) to pro-duce a scatterplot matrix for the first five variables of this data set, and answer the following questions:

(a) Is it more likely to have higher ozone levels on hot days? (b) Is it more likely to have higher ozone levels on windy days? (c) What seems to happen to ozone levels when there is increased solar radiation? (d) Which month seems to have the highest ozone levels?