Neco Model Questions Vol1 2022 Agricultural Science Question 9
Practice objective / multiple choice question 9 from the 2022 Neco Model Questions Vol1 Agricultural Science examination.
An extension officer wishes to evaluate a new fertilizer that is expected to increase maize yield by \(0.8\) t ha\(^{-1}\). From previous trials the standard deviation of yield is \(1.2\) t ha\(^{-1}\). To detect this difference with a 5 % significance level (two‑sided) and 80 % power, what is the minimum number of farms required in each of the treatment and control groups? (Use the formula \(n = 2\,(Z_{\alpha/2}+Z_{\beta})^{2}\sigma^{2}/\Delta^{2}\).)
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This is Neco Model Questions Vol1 2022 Agricultural Science Question 9. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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