statistics

posted by .

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 -

    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.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. STATISTICS

    Bacterial samples were taken from several surfaces in a daycare and incubated in petri dishes. After that the number of bateria colonies were counted, with the following results 412, 437, 425, 476, 451, 483. 1) construct a 95% confidence …
  2. math

    Explain how to solve: Sam is ordering pizza. Tony's Pizza charges $7 for a large cheese pizza plus $.75 for each additional topping. Maria's Pizza charges $8 for a large cheese pizza plus $.50 for each additional topping. For what …
  3. Elementary Statistics

    1) Construct a confidence interval of the population proportion at the given level of confidence. x=60,n=300, 99% confidence. The 99% confidence interval is (_,_) 2) A researcher wishes to estimate the proportion of adults who have …
  4. Statistics

    1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could …
  5. Statistics

    1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could …
  6. Statistics

    Exercise 8.92 Tony's Pizza guarantees all pizza deliveries within 30 minutes of the placement of orders. An agency wants to estimate the proportion of all pizzas delivered within 30 minutes by Tony's. What is the most conservative …
  7. Math

    Here is the problem: Christopher orders a three topping pizza for $15.25, and a 5 topping pizza for $17.75. Write and solve a system of linear equations to find the price of a plain cheese pizza (no toppings) and the cost of each topping. …
  8. Statistics

    A research worker wishes to estimate the mean of a population by using sufficiently large sample. At the confidence level of 99%,the sample mean will be within 35% of the standard deviation. How large a sample should be taken?
  9. statistics

    1. Suppose the estimate of a proportion of a normal population is to be within 0.05 using the 95% confidence level. How large a sample is required if: a. It is known from previous studies that p = 0.3?
  10. Algebra

    The cost of a large pizza is $7.99 plus an additional $0.99 for each topping. Tom ordered a large pizza that cost $10.96. Write and s olve an algebraic equation to find the number of toppings on the pizza.

More Similar Questions