2. The table below shows the yield of wheat in plots treated with different nitr

Question

2. The table below shows the yield of wheat in plots treated with different nitrogen fertilizer amounts (20 points) Yield (kg) 0 kg nitrogen (N)8 10 kg N applied 15 25 kg N applied 20 10 17 24 7 18 26 21 24 Please 1) test whether there is a significant effects of N applications on yield of wheat; 2) If this is an effect, please conduct multiple comparison on the yield 3. In a study of lettuce growth, 36 seedlings were randomly allocated to receive either High or Low light to be grown in either a standard nutrient solution or one containing extra nitrogen. After 16 days of growth, the lettuce plants were harvested, and the dry weight of the leaves were determined for each plants. The table below show the man leaf dry weight (gm) of the 9 plants in each treatment group. (20 points)

Explanation / Answer

1)

since p-value < 0.05

there is significant effects of N applications on yield of wheat

Anova: Single Factor SUMMARY Groups Count Sum Average Variance 0 kg 4 34 8.5 1.666666667 10 kg 4 71 17.75 6.25 25 kg 4 94 23.5 6.333333333 ANOVA Source of Variation SS df MS F P-value Between Groups 458.1666667 2 229.0833333 48.22807018 1.54977E-05 Within Groups 42.75 9 4.75 Total 500.9166667 11

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