Question: e = z p q n 2 , n = z 2 ( p q ) e 2 , n = s 2 z 2

e = z \sqrt[]{\frac{p q}{n}}, n = \frac{z^{2} (p q)}{e^{2}}, n = \frac{s^{2} z^{2}}{e^{2}}

Pow

-

IT is a high

-

technology firm specializing in electronk consumer products. Managers commassion the marketing research department to conduct a survey. and the critical question asks for likelihood to purchase the product on a

18 -

point scale. Management wants to be

99 %

coeffident of the results, and they want the accuracy to be within

+ - 3

scale points. What sample size should they use?

e = z p q n 2 , n = z 2 ( p q ) e 2 , n = s 2 z 2

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