Advanced Higher Statistics Practice Questions - Advanced Higher Statistics (Qualifications Scotland SCQF Level 7) Exam

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In an experimental trial comparing two crop fertilizers, fields are grouped into blocks based on soil moisture levels before randomly assigning fertilizer types within each block. What is the primary purpose of blocking in experimental design?

To prevent Type I errors from occurring during hypothesis testing To eliminate the need for a control group in the experiment To guarantee that the sample size in each treatment group is doubled To reduce nuisance variation attributable to known extraneous factors like soil moisture

Correct Answer:

To reduce nuisance variation attributable to known extraneous factors like soil moisture

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