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 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.

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Volume (mL)

Time (h)

Percent Absorbed

0.05

2

49.2

0.05

10

51.0

0.05

24

84.3

2.00

2

54.1

2.00

10

68.7

2.00

24

87.2

5.00

2

47.7

5.00

10

65.1

5.00

24

88.4

 
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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