Part A
The most likely value of the correlation coefficient can be obtained by examining if there is an existing relationship between Time(x) and Radius(y) from the given table.
From the table, as time increases from 1 to 4 days, the radius increases by two times. As we progress from 4 to 7 days, this change in radius is reduced.
Hence, the correlation coefficient is 0.94
The relationship between time and radius of the algae can be explained thus: for every increase in time (days), the radius of the increases but not steadily.
Part C
The data in the table does not indicate causation. It rather shows correlation.
This is because the change in the radius of the algae is not a result of the change in time.