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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 : Moment generating function for a random variable

The moment generating function for a random variable X is given by Mx(t) = (1/4)+ (3/4)*(1/(1-t)), t>1. Determine formulas for the density function and distribution function. Sketch graphs for fx and Fx.