statistics

posted by .

The Democrat and Chronicle reported that 25% of the flights arriving at the San Diego airport during the first five months of 2001 were late (Democrat and Chronicle, July 23, 2001). Assume the population proportion is p = .25.

1. Calculate () with a sample size of 1,200 flights (to 4 decimals).


2. What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 1,200 is selected (to 4 decimals)?


3. What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 600 is selected (to 4 decimals)?

  • statistics -

    bdjkgl

  • statistics -

    1) (sqrt(.25*(1-.25))/1200) = .0125

    2) .03/.0125 = 2.4 (z-score)
    -.03/.0125 = -2.4 (z-score)
    Find value using standard normal distribution table:
    2.4 = .9918
    -2.4 = .0082
    .9918-.0082 = .9836

    3) (sqrt(.25*(1-.25))/600) = .0177
    .03/.0177 = 1.69 (z-score)
    -.03/.0177 = -1.69 (z-score)
    Find value using standard normal distribution table:
    1.69 = .9545
    -1.69 - .0455
    .9545 - .0455 = .9090

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Statistics .05 level

    According to a survey conducted in October 2001, consumers were trying to reduce their credit card debt (Extracted from M. Price, “Credit Debts Get Cut Down to Size." Newsday, November 25, 2001, p. F3). Based on a sample of 1000 …
  2. government

    the major u.s political parties are the A)republican , reform, and democrat,B)republican and reform C)democrat and reform D)democrat and republican i think its a or c
  3. math

    2006 the population of a country was 32.4 million. This was a 4.1% increase since 2001. What was the population in 2001?
  4. statistics

    An SRS of 40 San Diego County Schools graduates showed that 26 of the 40 enrolled in a college or university right out of high school. a. Find a 90% confidence interval for the proportion of all San Diego County Schools graduates who …
  5. math HELP!!!!!!

    Suppose 10% of the flights arriving at an airport arrive early, 60% arrive on time, and 30% arrive late. Valerie used the random-number table to find the experimental probability that of 5 flights, at least 2 will arrive late. The …
  6. Collega Algebra

    Let f(x) = (2/4^x + 2) for real numbers x. Evaluate f(1/2001) + f(2/2001) + ... + f(2000/2001).
  7. College Algebra

    Let f(x) = (2/4^x + 2) for real numbers x. Evaluate f(1/2001) + f(2/2001) + ... + f(2000/2001).
  8. math

    Suppose 10% of the flights arriving at an airport arrive early, 60% arrive on time, and 30% arrive late. Valerie use the random number table to find the experimental probability that of 5 flights, at least 2 will arrive late. The digit …
  9. Math Check!

    Suppose 10% of the flights arriving at an airport arrive early, 60% arrive on time, and 30% arrive late. Valerie used the random-number table to find the experimental probability that of 5 flights, at least 2 will arrive late. The …
  10. CHECK MATH FAST!!!!!!

    You want to draft a four-player tennis team. There are eight players to choose from. How many different teams can you form?

More Similar Questions