Homework Help: statistics

Posted by paula on Sunday, March 17, 2013 at 10:29pm.

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

statistics - MathGuru, Monday, March 18, 2013 at 8:08pm
Use a formula to find sample size.

Here is one:
n = [(z-value * sd)/E]^2
...where n = sample size, z-value = 1.96 for 95% confidence, sd = 0.26, E = 0.15, ^2 means squared, and * means to multiply.

Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.

Answer this Question

Related Questions

math - Explain how to solve: Sam is ordering pizza. Tony's Pizza charges $7 ...
Geometry check my answer? - Small Pizza- radius 6 in. cost $9.75 Medium- radius...
Geometry Ms. Sue help please? - Ms. Sue, can you help me again? you replied to ...
algebra - the diameter of a small pizza is 16cm. this is 2 cm more than two ...
algebra - The radius of a large pizza is two times plus 3 inches larger than a ...
math - the diameter of a small pizza is 16 centimeters. this is 2 cm more than 2...
Algebra - A LARGE PIZZA COSTS $8.95,PLUS 0.65 FOR EACH ADDITIONAL TOPPING.REMI ...
STATISTICS - Bacterial samples were taken from several surfaces in a daycare and...
Math - A local pizza shop sells large pies for $7 each. If the cost of the order...
11th grade Algebra 2 - A large pizza from Papa's Pizzeria has a diameter of ...

For Further Reading

First Name:
School Subject:
Answer: