In recent years, some evidence suggests that high indoor radon concentration may be linked to the development of childhood cancers, but many health professionals remain unconvinced. The article “Indoor Radon and Childhood Cancer” (Lancet 1991: 1537–1538) presented the accompanying data on radon concentration (Bq/m3) in two different samples of houses. The first sample consisted of houses in which a child diagnosed with cancer had been residing. Houses in the second sample had no recorded cases of childhood cancer.

a. Construct a side-by-side stem-and-leaf display, and comment on any interesting features. 

b. Calculate the standard deviation of each sample. Which sample appears to have greater variability, according to these values?
c. Calculate the iqr for each sample. Now which sample has greater variability, and why is this different than the result of part (b)?

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Cancer: 3 11 16 22 5 5 11 6 7 8 9 9 10 10 10 11 11 12 13 13 15 15 15 18 20 21 21 16 16 17 18 18 22 23 23 27 33 34 38 39 45 No cancer: 3 9 12 29 57 210 35 6 6 7 7 7 8 8 99 9 11 11 11 11 11 12 24 29 13 14 17 17 21 21 24 29 29 33 38 39 55 55 85