Deaths 2014 A National Vital Statistics Report...

Deaths 2014 A National Vital Statistics Report (www.cdc.gov/nchs/) provides information on deaths by age, sex, and race. Below are displays of the distributions of ages at death for White and Black males: a. Describe the overall shapes of these distributions. b. How do the distributions differ? c. Look carefully at the bar definitions. Where do these plots violate the rules for statistical graphs?

Deaths 2014 A National Vital Statistics Report (www.cdc.gov/nchs/) provides information on deaths by
age, sex, and race. Below are displays of the distributions of ages at death for White and Black males:
a. Describe the overall shapes of these distributions.
b. How do the distributions differ?
c. Look carefully at the bar definitions. Where do these plots violate the rules for statistical graphs?

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Key Concepts

Distribution Shape

This concept involves understanding and describing the general form and pattern of a data distribution, including aspects such as symmetry, skewness (whether the tail is longer on one side), modality (the number of peaks), and kurtosis (the ‘tailedness’). It is fundamental in statistics when analyzing how data values are spread out, providing insights into tendencies and variability within the data set.

Comparative Distributions

Comparing distributions is about examining two or more data sets to identify similarities and differences in their statistical properties such as central tendency, variability, and overall shape. This process is essential when assessing whether different groups or populations, in this case defined by race and sex, exhibit distinct patterns or trends in the measured variable.

Statistical Graph Design

This key concept focuses on the principles and guidelines for creating accurate and effective visual representations of data. It includes proper use of bar widths, scales, labels, and the distinction between continuous and categorical data in visual displays. Adhering to these rules ensures that graphs convey the intended information without misleading the viewer, such as by avoiding artificial gaps or misaligned bars that violate fundamental standards of statistical visualization.

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