Statistics

posted by .

How would I find the confidence level (in %) if I am given the standard deviation, size of the random sample, and confidence interval?

  • Statistics -

    You would solve for the z-value using the margin of error (derived from the confidence interval), standard deviation, and the sample size.

    Margin of error = z-value (sd/√n)

    Once you have the z-value, find the percentage using a z-table.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. statistics

    Help!!!!!! A confidence interval estimate for the population mean is given to be (39,90, 48.11) If the standard deviation is 11.473 and the sample size is 52 determine the maximum error of the estimate. determine the confidence level …
  2. Math

    How would I find the confidence level (in %) if I am given the standard deviation, size of the random sample, and confidence interval?
  3. Math Statistics

    5. Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 36 students Sample mean: 29.643 years Sample standard deviation: 4.564 years …
  4. Statistics

    We have calculated a 95% confidence interval for a proportion and would prefer the confidence interval to be more precise, that is narrower. Using the same sample, we can narrow the confidence interval using which of the following?
  5. Statistics

    When consumers apply for credit, their credit is rated using the FICO score. A bank manager used a random sample of the credit scores of 18 customers and determined the following 95% confidence interval: (613.6, 708.0) If the sample …
  6. Statistics

    Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician …
  7. Statistics

    The standard deviation for a population is σ = 15.3. A sample of 36 observations selected from this population gave a mean equal to 74.8. a) Make a 90% confidence interval for μ b) Construct a 95% confidence interval for …
  8. Statistics

    A random sample of 90 observations produced a mean that = 25.9 and a standard deviation s =2.4 (a)Find a 95% confidence interval for u (b)Find a 90% confidence interval for u (c)Find a 99% confidence interval for u (Use integers or …
  9. Statistics

    Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 100, with a sample size of (i) 400, (ii) 1600. What is the effect of the sample size?
  10. Statistics

    Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 100, with a sample size of (i) 400, (ii) 1600. What is the effect of the sample size?

More Similar Questions