In the following biological experiment 4 concentrations of a certain chemical are used to enhance the growth of a certain type of plant over time. Five plants are used at each concentration and the growth in each plant is measured in centimeters. The following growth data are taken. A control (no chemical) is also applied. Use Dunnett's two-sided test at the 0.05 level of significance to simultaneously with thecontrol.

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Concentration Control 6.8 4 7.7 6.9 8.4 5.9 8.2 8.7 9.4 7.3 6.3 6.9 5.8 8.6 7.2 9.2 8.1 6.8 7,1 6.1 6.9 5.7 6.1 7.1 S.6 8.0