Question: A preliminary study of factors affecting the growth of seedlings involved a comparison of the total leaf area (cm2) after 15 days’ growth for each of 12 plants grown from seedlings which had been randomly allocated to the two treatment groups of low or moderate light conditions. A Minitab analysis was carried out; some output is shown below.

1. For each circled element in the output explain how it was calculated.
2. Interpret the results of the statistical analysis. [4 marks]
3. Formally test the hypothesis that the standard deviation of responses does not depend on the light level.
4. Calculate a confidence interval for the average leaf area per plant after 15 days growth for plants exposed to moderate tight conditions.
5. Explain the model that underlies alt the analyses.
6. Outline the considerations involved in planning sample sizes for studies of this type.

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