7.1 Consider an experiment to investigate the effects of sugar on the length of pea sections grown in tissue culture. A CRD is used with 5 replications for each of the treatments: T: Control (nothing added) T2: 2% glucose added T3: 3% glucose added T4: 2% fructose added T: 1% glucose +1% fructose added (i) Obtain a complete set of meaningful orthogonal contrasts and explain what each contrast means. (ii) Suppose we obtain the following results:

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Treatment 1 2 3 4 5 Mean 70.1 59.3 58.2 58.0 64.1 and the following partial ANOVA table Source SS Treatments 538.66 Error 245.50 Total 784.16