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Cost of Pizzas A pizza shop owner wishes to find the 95%
Chapter 7, Problem 24E(choose chapter or problem)
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.
Questions & Answers
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.