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Suppose that a national real estate magazine advertised that 10​%of​ first-time home buyers had a family...

Suppose that a national real estate magazine advertised that 10​%of​ first-time home buyers had a family income below $41,000.

A national real estate firm believes this percentage is too low and samples100of its records. The firm finds that20of its​ first-time home buyers did have a family income below

$41,000.

Does the sample suggest that the proportion of​ first-time home buyers with an income less than​ $41,000 is more than10​%?

Comment and write up your own conclusions based on an appropriate confidence interval as well as a hypothesis test. Include any assumptions you made about the data.

Create a 90​%confidence interval.

Math   Statistics-And-Probability   
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