Question

1) What are the differences between a bar graph and a histogram.

2) A scatter plot describes a graph of bivariate data. If strong correlation exists between the 2 variables, does that mean that one causes the other? Explain.

3) A scatter plot describes a graph of bivariate data. If there's weak correlation exists between the 2 variables, does that mean that one causes the other? Explain.

Answer 1

1) The main difference between a bar chart and a histogram is that, in a bar chart, the labels in the X axis are categorical; while in histogram, we have the labels as numeric or quantitative values.

​​This also gives rise to the difference that, in a histogram, we can talk about the skewness of the data set, but in a bar chart, talking about the skewness is invalid, because the labels are purely categorical.

2) Even if the data set shows that the two variables have a very strong correlation, this does not mean that one causes another; this is because correlation is only a measure of linear association and does not imply causation.

3) Even if the data set shows that the two variables have a very weak correlation, this does not mean that one causes another; this is because correlation does not imply causation.