2.3.3 Hoekema et al. (A-3) studied the craniofacial morphology of patients diagnosed with obstructive sleep apnoea syndrome (OSAS) in healthy male subjects. One of the demographic variables the researchers collected for all subjects was the Body Mass Index (calculated by dividing weight in kg by the square of the patient's height in cm). The following are the BMI values of 29 OSAS subjects. 33.57 27.78 40.81 38.34 29.01 47.78 26.86 54.33 28.99 25.21 30.49 27.98 36.42 41.50 29.39 24.54 41.75 44.68 24.49 33.23 47.09 29.07 28.21 42.10 2.3.4 26.54 27.74 33.48 31.44 30.08 SOURCE: A. Hoekema, D.D.S. Used with permission.

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

(b) What percentage of the measurements are less than 30?

(c) What percentage of the measurements are between 40.0 and 49.99 inclusive?

(d) What percentage of the measurements are greater than 34.992

(e) Describe these data with respect to symmetry and skewness as discussed in Exercise 2.3.1, part h.

(f) How many of the measurements are less than 40?