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In a survey conducted by CNN, 130 of the 250 people surveyed have a savings account....

In a survey conducted by CNN, 130 of the 250 people surveyed have a savings account.

(a) Construct a 90% confidence interval to estimate the true population proportion of people that have a savings account.

(b) Suppose CNN is going to conduct this survey again. If we want our estimate to be within 3% of the true population proportion with 90% confidence, how many people do we need to sample?

math   Statistics-And-Probability   
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