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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 : Question regarding the average educational level

They find the average educational level to be 14 years, and the SD is 5years. Can the difference in average educational level between thesample and the nation be explained by chance variation? If not,what other explanation can you give?