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A researcher studying public opinion of proposed Social security changes obtained a simple random sample of 30 adult Americans and asked them whether or not they support the proposed changes. To say that the distribution of the sample proportion of adults who respond yes, is approximately normal, how many more adult Americans does the researcher need to sample in the following cases?
a) 20% of all adults Americans support the changes.
b) 25% of all adult Americans support the changes.

Sagot :

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