a)
Histogram
b)
Line diagram
c)
Bar chart
d)
Scatter plot
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Ans: d
Scatter plot can be used to reveal relationships between 2 quantitative variables. The hypothesized exposure variable (cause or independent variable) is plotted on X axis and the effect variable (dependent variable) is plotted on Y axis. A dot or point is plotted for each pair of observations. If the dots of all the observations fall along a line (or a curve), we could conclude that there is a correlation between the 2 variables.
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