Neco 2021 Agricultural Science Question 16
Practice objective / multiple choice question 16 from the 2021 Neco Agricultural Science examination.
A farmer monitors a 5‑ha maize field. He randomly samples 20 plants and rates disease severity on a scale of 0-5 (0 = no symptoms, 5 = severe). The sum of the severity scores is 48. The disease index (DI) is calculated as DI = ( \( \frac{\Sigma \text{severity scores}}{n \times 5} \times 100 \) ). The recommended fungicide application threshold is DI \( \ge \) 30 %. (a) Compute the DI and state whether the farmer should apply the fungicide. (b) Assuming the observed standard deviation of severity scores is 1.4, determine how many additional plants must be sampled so that the standard error of the mean severity does not exceed 0.2, using a 95 % confidence level (z = 1.96).
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About This Question
This is Neco 2021 Agricultural Science Question 16. It is one of the objective questions from the 2021 Neco Agricultural Science examination.
Difficulty level: Medium .
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