Question

An entomologist wishes to estimate the average development time of the citrus red mite, a small spider-like insect that causes damage to leaves and fruit, correct to within 0.2 day. From previous experiments it is known that σ is approximately 3 days. What minimum sample should the entomologist take to be 95% confident of her estimate? (Round your answer up to the nearest whole number.)

n ≥ mites

(B)

A grower believes that one in five of his citrus trees are infected with the citrus red mite. What minimum sample should be taken if the grower wishes to estimate the proportion of his trees that are infected with citrus red mite to within 0.03 with a confidence level of 95%? (Round your answer up to the nearest whole number.)

n ≥ trees

Answer 1