We want to estimate the proportion of cities that have private refuse collectors. We want to estimate the population proportion with a margin of error of 0.10, with a confidence level of 90%, with a prior population proportion of 40%. What is the required sample size?

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Q: Distinguish between necessary and sufficient causes, giving examples.

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Q: 5(b). Suppose now that X1, X2, X3 and X4 are all independent random variables, each having the norma...

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A: As per our guidelines, we can answer only the first three sub-parts Kindly repost the others for ans...