Butz et al. (A-10) evaluated the duration of benefit derived from the use of noninvasive positive pressure ventilation by patients with amyotrophic lateral sclerosis on symptoms, quality of life, and survival. One of the variables of interest is partial pressure of arterial carbon dioxide (PaCO2). The values below (mm Hg) reflect the result of baseline testing on 30 subjects as established by arterial blood gas analyses

40.0, 47.0, 34.0, 42.0, 54.0, 48.0, 53.6, 56.9, 58.0, 45.0, 54.5, 54.0, 43.0, 44.3, 53.9, 41.8, 33.0, 43.1, 52.4, 37.9, 34.5, 40.1, 33.0, 59.9, 72.6, 54.1, 45.7, 40.6, 56.6, 59.0

For the data sets compute (a) the mean, (b) the median, (c) the mode, (d) the range, (e) the interquartile range (f) The Standard Deviation. Treat data set as a sample. For this data set, you think it would be appropriate, construct a box-and-whisker plot and discuss the usefulness in understanding the nature of the data that this device provides. For this data set select the measure of central tendency that you think would be most appropriate for describing the data. Give reasons to justify your choice. Also, interpret your findings.