40 47 34 42 54 48 54 57 58 45 54 54 43 44 63 42 33 43 52 38 Draw a histogram of the data. You may use a computer program (Excel or Matlab) for this step. (Use Sturges' rule to determine a good number of bins, and a good bin range.
Butz et al. evaluated the duration of benefit derived from the use of noninvasive positive-pressure
ventilation by patients with amyotrophic lateral sclerosis (ALS) on symptoms, quality of life and
survival. ALS, aka Lou Gehrig's Disease, is a degenerative disease of the motor neurons. One of the
variables of interest is partial pressure of arterial carbon dioxide (PaCO2). The values below (measured
in mm Hg) reflect the results of baseline testing on 20 of the 30 subjects in the study, as established by
arterial blood gas analyses. (Am. J Med. Rehab. 2003, 82:597-604)
40 47 34 42 54 48 54 57 58 45
54 54 43 44 63 42 33 43 52 38
Draw a histogram of the data. You may use a computer program (Excel or Matlab) for this
step. (Use Sturges' rule to determine a good number of bins, and a good bin
ranges should be reasonable, like 15-19, not 13.4-18.3.)
Hint:
To create a histogram, you would first need to decide on the bin ranges. Since the data is numerical and ratio, you would want to choose bin ranges that are in whole numbers and that cover the range of the data. Based on the data provided, a reasonable set of bin ranges could be: 30-34 35-39 40-44 45-49 50-54 55-59 60-64
Then, you would count the number of data points that fall within each bin range and use that information to create a bar chart, with the x-axis representing the bin ranges and the y-axis representing the frequency of data points. Each bar would represent the number of data points that fall within the corresponding bin range.
It's important to note that the bin ranges can be customized to your needs, you can adjust the width of bins, the number of bins, or the range of bins.
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