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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 : Margin of error associated-confidence interval

In the sample, the mean score is 64 points, and the standard deviation is 12 points. What is the margin of error associated with the confidence interval?