The ten plants in the control plot have mean height 36.5 and sample variance of 17.2. Compare with the results in Exercise 18.
Consider again the data in Exercises 17-20, but suppose that variances are unknown. Use the sample variance for the experimental population found in the earlier problem and the given sample variance for the control population to perform a t test on these unpaired populations.

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Plant Weight Height Yield Number of seeds 11.83 7.65 14.57 14.97 46.2 10.11 9.29 414 12.26 6.61 14.26 38.5 9.51 8.34 39.8 13.35 7.04 37.9 12.90 34.8 10.35 9.84 39.4 18 40.8 16 17 11.26 11.08 40.7 21 5.44 20 10 11.82 43.1