Minimum sample size needed assuming


1. A researcher wishes to estimate with 90% confidence, the proportion of adults who have high-speed Internet access. He estimate must be accurate within 5% of the true proportion.

a) What is the minimum sample size needed using a prior study that found that 48% of the respondents said they have high-speed Internet access? (Round to nearest whole number.)

b) What is the minimum sample size needed assuming that no preliminary estimate is available?

(Round to the nearest whole number.)

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Basic Statistics: Minimum sample size needed assuming
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