The fruit ynbspdrosophila melanogasternbspnormally has a, Ask an Expert

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The fruit ?y Drosophila melanogaster normally has a gray color. However, because of mutation a good portion of them are black. A biologist eager to learn about the effect of mutation wants to collect a random sample to estimate the proportion of black fruit ?ies of this type within 1% error with 95% con?dence.

(a) How many individual ?ies should the researcher capture if there is no information on the population proportion of black ?ies?

(b) Suppose the researcher has the initial estimate that 25% of the fruit ?y Drosophila melanogaster have been affected by this mutation. What is the sample size?

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