7 STATS MATHGURU PLEASE HELP

posted by .

A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99%confidence assuming s=17.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in cofidence affect the sample size required?

A: A 99% confidence level requires ___ subjects

B: A 90% confidence level requires ___ subjects

  • 7 STATS MATHGURU PLEASE HELP -

    2.58 = 99% confidence interval
    1.645 = 90% confidence interval

    Use a formula to find sample size.

    Here is one:
    n = [(z-value * sd)/E]^2
    ...where n = sample size, z-value = values above for the intervals needed, sd = 17.8, E = .02, ^2 means squared, and * means to multiply.

    Plug the values into the formula and finish the calculations. Round your answers to the next highest whole number.

    I'll let you take it from here.

  • 7 STATS MATHGURU PLEASE HELP -

    A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 44 points with 99 %99% confidence assuming s equals 11.2s=11.2 based on earlier​ studies? Suppose the doctor would be content with 90 %90% confidence. How does the decrease in confidence affect the sample size​ required?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Computers

    Create a class named Checkup with fields that hold a patient number, two blood pressure figures (systolic and diastolic), and two cholesterol figures (LDL and HDL). Include methods to get and set each of the fields. Include a method …
  2. biostatistics

    7. Consider again the data in problem #6. Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation …
  3. statistics

    Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. a)Is there evidence of …
  4. college biology

    Why LDL is considered the bad cholesterol and HDL the good cholesterol
  5. Statistics 7

    A doctor wants to estimate the HDL cholesterol of all 20 to 29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming s-17.8 based on earlier studies. Suppose the …
  6. statistics

    In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL …
  7. Statistics

    A doctor want to estimate the HDL cholesterol of all 20- to 29- year old females. how many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confindence assuming s=15.8 based on earlier studies?
  8. Math

    A researcher wants to estimate the mean blood cholesterol level of young men ages 15-25 with a 97.59% confidence interval. The blood cholesterol level of young men follows a Normal distribution with standard deviation σ = 15 mg/dl. …
  9. Statistics

    A doctor want to estimate the HDL cholesterol of all 20- to 29- year old females. how many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confindence assuming s=10.5. Suppose the doctor would be content …
  10. Stats

    HELP!! I have no idea to get this answer :( a doctor wants to estimate the HDL cholesterol of all 20-29 year old females. how many subjects are needed to estimate the HDL cholesterol within 4 points with 99% confidence assuming the …

More Similar Questions