Cost of Pizzas A pizza shop owner wishes to find the 95%

Chapter 7, Problem 24E

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QUESTION:

Cost of Pizzas A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.15?A previous study showed that the standard deviation of the price was $0.26.

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QUESTION:

Cost of Pizzas A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.15?A previous study showed that the standard deviation of the price was $0.26.

ANSWER:

Solution:

Step 1 of 2:

          From the given problem, we have

         

          The standard deviation .  

                                                E = 0.15  

    Here we have to find the sample size.


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