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Increased from a sample

A marketing analyst at an Internet book store is testing a new web design which hopes to increase sales. She wants to randomly send n customers to the new site. She's hoping for in an increase of 10% in sales from the new site. She calculates a power of 0.43 for that increased from a sample of 150 customers. Explain to her why she should consider a larger sample size.

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## Q : Calculating standard deviation

What information does calculating standard deviation provide? How is the z-score related to standard deviation? What values do you need to calculate a z-score?