The scientist in Example 7.1 has repeated the experiment, this time with a new design. The result
The scientist in Example 7.1 has repeated the experiment, this time with a new design. The results are presented in the following table.
The scientist plots the percent absorbed against both volume and time, as shown in the following figure.
She then calculates the correlation between volume and absorption and obtains r = 0.121. She concludes that increasing the volume of the chemical has little or no effect on the percentage absorbed. She then calculates the correlation between time and absorption and obtains r = 0.952. She concludes that increasing the time that the skin is in contact with the chemical will cause the percentage absorbed to increase. Are these conclusions justified?
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