visualising distributions Flashcards
what are distributions
Examining sets of quantitative values to see how the values are distributed from lowest to highest
▰ Compare and contrast how multiple sets of values are distributed
what are the visual characteristics of distributions
Visual Characteristic of Distributions
▻ Spread
▻ Center
▻ Shape
what are the statistical summaries of distributions
Statistical Summaries of Distributions
▻ 3-value summary of distribution
▻ 5-value summary of distribution
what does spread tell
range of the data. distance bet highest and lowest value s
what does the center tell
estimate of middle set of values or value that is most typical
what does the shape tell
where the values are located
what does upward curved distribution tell
Number of items or frequency begins relatively low, increases to a peak and then decreases until relatively low.
what does downward curved distribution tell
Downward – less common.
what is it called when there are 2 peaks
bi modal
what does skew refer to
direction of the tail
what are the single distribution displays
▻ Histograms
▻ Frequency Polygons
▻ Strip Plots
▻ Stem-and-Leaf Plots
what are the multiple distribution displays
▻ Box Plots
▻ Multiple strip plots
▻ Frequency polygons
▻ Distribution deviation graph
what do the bars on histograms tell
display a distribution
what is x - axis and y - axis for a histogram
X-axis – categorical scale; Y-axis – quantitative scale
difference between histogram and bar chart
Histograms are used to show distributions of variables while bar charts are used to compare variables.
Histograms plot binned quantitative data while bar charts plot categorical data. Bars can be reordered in bar charts but not in histograms
