STA301 GDB 01 Solution Fall 2021
STA301 GDB 01 Solution Fall 2021
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Question # 1
Why do we need to compute the measure of dispersion (variance and standard deviation) even if we have computed the measure of central tendency (mean, median, and mode, etc.)?
Answer:
Measures of central tendency are used to estimate "normal" values of a dataset, measures of dispersion are important for describing the spread of the data, or its variation around a central value. Two distinct samples may have the same mean or median, but completely different levels of variability, or vice versa.
Question # 2
What is the difference between Pie Chart and Bar Chart? Why do we use them?
Answer:
Pie charts show how much each category represents as a proportion of the whole, by using a circular format with different-sized “slices” for different percentages of the whole. Bar graphs use a series of rectangular bars to show absolute values or proportions for each of the categories.
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