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A financial company gives its banking customers a commission if they refer new people to open...

A financial company gives its banking customers a commission if they refer new people to open bank accounts. As a​ result, 65​% of new customers at the bank came from referrals in 2014. Another bank had 16​ referrals last year​ (out of a total of 65,000 new​ customers) and has increased the commission this year. It expects to achieve 20​% referrals this year and picks a random selection of 300 new customers and finds that 18% of them came from referrals.

Q: Calculate the power of the​ test, based on the expected increase.

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