statistics

posted by .

The National Center for Education surveyed 4400 college graduates about the lengths of time required to earn their bachelor's degrees. The sample mean is 5.15 years, and assume that standard deviation is known to be 1.68 years. Based on the sample data, construct the 99% confidence interval for the mean time required by all college graduates. Also determine the margin of error, E.

  • statistics -

    Formula using 99% confidence interval:

    CI99 = mean ± [(2.58)(sd/√n)]

    Note: Within the brackets is the margin of error.

    Your data:

    mean = 5.15
    sd = 1.68
    n = 4400

    Plug the values into the formula and calculate.

    I hope this will help get you started.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. statistics

    The Colorado State Legisture wants to estimate the length of timer it takes a resident of Colorado to earn a Bachelor's degree from a state college or university. A random sample of 265 recent in-wstate graduates was surveyed (a) identify …
  2. statistics

    we developed a 95% z confidence interval for the mean BMI of women aged 20 to 29 years, based on a national random sample of 654 such women. we assumed there that the population standard deviation was known to be 7.5. in fact the sample …
  3. statistics

    At a large publishing company, the mean age of proofreaders is 36.2 years, and the standard deviation is 3.7 years. If a random sample of 15 proofreaders is selected, find the probability that the mean age of the proofreaders in the …
  4. Statistics

    An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within one year of the population mean. Assume the population of ages is normally distributed. Determine the minimum …
  5. math

    The National Center for Education surveyed 4400 college graduates about the lengths of time required to earn their bachelor's degrees. THe sample mean is 5.15 years, and assume that the population standard deviation is known to be …
  6. Math

    A random sample of 42 college graduates revealed that they worked an average of 5.5 years on the job before being promoted. The sample standard deviation was 1.1 years. Using the .99 degree of confidence, what is the confidence interval …
  7. statistics

    A headline in a certain newspaper states that "most stay at first job less than 2 years." That headline is based on an online poll of 320 college graduates. Among those polled, 72% stayed at their first full-time job less than 2 years. …
  8. Statistics

    The Economic Policy Institute periodically issues reports on wages of entry-level workers. The institute reported that entry-level wages for male college graduates were $21.68 per hour and for female college graduates were $18.80 per …
  9. Statistics

    Years to Earn Bachelor’s Degree: Listed below are the lengths of time ( in years) it took for a random sample of college students to earn bachelor’s degrees ( based on data from the U. S. National Center for Education Statistics). …
  10. Statistics Homework

    Statistics Question: Years to Earn Bachelor's Degree Years to Earn Bachelor's Degree: Listed below are the lengths of time (in years) it took for a random sample of college students to earn bachelor's degrees (based on data from the …

More Similar Questions