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Return to Presenting Scientific Data in R Student Resources
Chapter 6 Multiple Choice Questions
Quiz Content
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Scientists often use the term '___________' to refer to a mutual relationship or connection between the values of multiple variables.
Your response
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Complete the statement: "A scatterplot is most useful if…"
…you want to see how scattered a data set is.
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…you have data that is very scattered and want to display it in a compact way.
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…you want to spread out a sample of data so that individual points can be seen clearly.
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…you want to explore the relationship between two variables.
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What might a strong negative correlation between two variables suggest?
If one variable is negative, so will be the associated value of the other variable.
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There is strong evidence of no relationship between the two variables.
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Points in the associated scatterplot will be tightly grouped around a straight line of negative gradient.
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Corresponding values of two variables have opposite signs.
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What is a univariate scatterplot more commonly referred to as?
A histogram
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A bar chart
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A strip-chart
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A boxplot
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Complete the statement: "If an experiment involves the manipulation of variable A and recording of the consequences of this for variable B, then in a scatterplot values of variable A should normally be plotted against…"
…the y-axis, but with any units described in the figure caption only.
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…the y-axis.
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…the x-axis.
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…neither axis, as variable A should be explained in the figure caption only.
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What is the main reason you might want to restrict a line of best fit on a scatterplot?
It is unwise to assume the same relationship continues beyond the span of your data.
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Unrestricted lines clutter a graph.
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Unrestricted lines make it harder to see the data points.
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Unrestricted lines can be lost underneath your legend.
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If some of the data points in a scatterplot are displayed as squares and some as triangles, what can be inferred?
The greater number of sides means that the squares represent higher values of a third variable than do the triangles.
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Two different data sets are plotted on the same axes.
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The triangles represent data recorded before an intervention and the squares represent data recorded after the intervention.
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The data represented by the different shapes differ in importance with respect to the figure's overall message.
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When would you expect to find a legend accompanying a scatterplot?
When a trend line has been fitted to the sample
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When the data shows a strong correlation
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When the data shows a positive correlation
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When data for several different samples are shown in one plot
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What sort of data might a strip-chart be an effective visualization tool for?
Time series data
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Positively correlated data
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Data with 200 data points or more
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Data with 20 data points or fewer
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In a strip-chart, what design choice could be used to help achieve separation of points with similar or identical values?
Using different colours
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Switching to a boxplot
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Adding jitter
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Using different point shapes
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