Janardhan et al. (A-2) conducted a study in which they measured incidental intracranial aneurysms

(IIAs) in 125 patients. The researchers examined postprocedural complications and concluded that IIAs can be safely treated without causing mortality and with a lower complications rate than previously reported. The following are the sizes (in millimeters) of the 159 IIAs in the sample.

8.1 10.0 5.0 7.0 10.0 3.0 20.0 4.0 4.0 6.0 6.0 7.0 10.0 4.0 3.0 5.0 6.0 6.0 6.0 6.0 6.0 5.0 4.0 5.0 6.0 25.0 10.0 14.0 6.0 6.0 4.0 15.0 5.0 5.0 8.0 19.0 21.0 8.3 7.0 8.0 5.0 8.0 5.0 7.5 7.0 10.0 15.0 8.0 10.0 3.0 15.0 6.0 10.0 8.0 7.0 5.0 10.0 3.0 7.0 3.3 15.0 5.0 5.0 3.0 7.0 8.0 3.0 6.0 6.0 10.0 15.0 6.0 3.0 3.0 7.0 5.0 4.0 9.2 16.0 7.0 8.0 5.0 10.0 10.0 9.0 5.0 5.0 4.0 8.0 4.0 3.0 4.0 5.0 8.0 30.0 14.0 15.0 2.0 8.0 7.0 12.0 4.0 3.8 10.0 25.0 8.0 9.0 14.0 30.0 2.0 10.0 5.0 5.0 10.0 22.0 5.0 5.0 3.0 4.0 8.0 7.5 5.0 8.0 3.0 5.0 7.0 8.0 5.0 9.0 11.0 2.0 10.0 6.0 5.0 5.0 12.0 9.0 8.0 15.0 18.0 10.0 9.0 5.0 6.0 6.0 8.0 12.0 10.0 5.0 5.0 16.0 8.0 5.0 8.0 4.0 16.0 3.0 7.0 13.0 Source: Data provided courtesy of Vallabh Janardhan, M.D.

(a) Use these data to prepare:
A frequency distribution A relative frequency distribution A cumulative frequency distribution A cumulative relative frequency distribution A histogram A frequency polygon

(b) What percentage of the measurements are between 10 and 14.9 inclusive?

(c) How many observations are less than 20?

(d) What proportion of the measurements are greater than or equal to 25?

(e) What percentage of the measurements are either less than 10.0 or greater than 19.95?

(f) Refer to Exercise 2.3.1, part h. Describe the distribution of the size of the aneurysms in this sample.