Statistics

posted by .

142 out of 507 people were right. Calculate a 95% confidence interval for the proportion of the entire population that could be right. I did some of the work and got .72...don't know what to do with this? Please help.

  • Statistics -

    p = 142/ 507 = 0.28

    SD = sqrt(p(1-p)/n)


    0.28-+ 0.039

    (.241, .319)

  • Statistics -

    so I could say that with 95% confidence, between 24.1% and 31.9% of the entire population could be right?

  • Statistics -

    you know I am getting .0199 SD =srt(.28(1-.28)/506 = .0119? Please check for me again?

  • Statistics -

    YES. IF YOUR PROFESSOR SAID THAT YOUR ANSWER SHOULD BE IN PERCENT.

    P = 142/507 = 0.28

    SD = SQRT( .28*.72/507)

    SQRT(0.2016/507) = 0.0199

    Z = 1.96

    0.28-+1.96*0.0199

    0.28-+ 0.039
    ( 0.241, 0.319)

  • Statistics -

    I get it now...I was missing a step too! Thanks Much!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Statistics

    A confidence interval was used to estimate the proportion of statistics students that are females. A random sample of 72 statistics students generated the following 90% confidence interval: (0.438, 0.642). Based on the interval above, …
  2. Statistics

    A confidence interval was used to estimate the proportion of statistics students that are females. A random sample of 72 statistics students generated the following 90% confidence Interval: (.43, .63). based on the interval above, …
  3. Statistics

    The AP reported that in a sample of 507 people only 142 correctly described the Bill of Rights as the first ten amendments to the U.S. Constitution. Calculate a 95% confidence interval for the proportion of the entire population that …
  4. Statistics

    Which of the following statements best describes the uncertainty associated with a 95% confidence interval for a population proportion, computed from a simple random sample?
  5. 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 …
  6. Statistics

    In a survey of 633 males ages 18-64, 395 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. …
  7. 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 …
  8. Math

    5. The following random sample was selected : 4, 6, 3, 5, 9, 3. Find the 95% confidence interval for the mean of the population. 6. In a sample of 35 high school seniors, 14 of them are attending college in the fall. Find the 95% confidence …
  9. Statistics

    142 out of 507 people were right. Calculate a 95% confidence interval for the proportion of the entire population that could be right. I did some of the work ‚ĶPlease help. I am getting .0199 SD =sqt(.28(1-.28)/506 = .0119 so .28 …
  10. statistics

    An online site presented this question, 'Would the recent norovirus outbreak deter you from taking a cruise?

More Similar Questions