2. Find the minimum sample size needed to be 90% confident that the true proportion of students who receive financial aid is accurate within 1% of the population proportion.

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2. Find the minimum sample size needed to be 90% confident that the true proportion of students
who receive financial aid is accurate within 1% of the population proportion.
3. A study done by the Water Quality and Health Council found that in a simple random sample of
21 people who used public restrooms, 23% of people washed their hands with water only (when
soap was available). B Construct a 95% confidence interval for the population proportion of people
who wash their hands with only water when using a public restroom.
Transcribed Image Text:2. Find the minimum sample size needed to be 90% confident that the true proportion of students who receive financial aid is accurate within 1% of the population proportion. 3. A study done by the Water Quality and Health Council found that in a simple random sample of 21 people who used public restrooms, 23% of people washed their hands with water only (when soap was available). B Construct a 95% confidence interval for the population proportion of people who wash their hands with only water when using a public restroom.
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