Plants outside the plot have mean yield 9.0.
Consider again the weights, heights, yields, and seed number for 10 plants given in Exercises 1-4. Find the sample variance for each and use the t distribution to perform a two tailed test of the hypothesis.

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Plant Weight Height Yield Number of seeds 1183 46.2 10.11 7.65 39.4 9.29 14.57 4.4 12.26 6.61 9.51 8.34 39.8 13.35 37.9 12.90 34.8 10.35 11.82 43.1 9.84 14.97 14.26 11.26 11.08 7.04 5.44 40.8 38.5 40.7 10