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 with 90% confidence. How does the decrease in confidence affect the sample size​ required?

  1. 👍
  2. 👎
  3. 👁
  1. margin of error = z( s/sqrt n)

    me^2 = (z^2)(s^2)/n

    n = (z^2)(s^2)/me^2

    n =(2.33)^2 ( 10.5)^2 /3^2
    n = 5.43(110.25)/9
    n = 66.5 so you need 67 people

    repeat the problem using 1.28 for z.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

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

  2. Health

    What is a doctor’s responsibility if a patient requests restrictions on the use of his or her PHI? A. The doctor must comply with the patient’s wishes. B. The doctor need not comply with the patient’s wishes if HIPAA would

  3. 7 STATS MATHGURU PLEASE HELP

    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

  4. Math

    Each female of a certain species of fish lays 100 eggs each fall and then dies. If only 30% of these eggs mature to become egg-producing females the next year , then how many egg-producing females will descend from a single

  1. 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

  2. science - real life events

    You are a cardiologist and you are treating a pregnant patient who is at a high risk of getting a heart attack. Anti-cholesterol drugs are important in preventing a heart attack as it stops cholesterol building up in the blood

  3. Math

    The back-to-back stem-and-leaf plot below shows the ages of patients seen by two doctors in a family clinic in one day. Compare the ages of the patients of doctor 1 and doctor 2 using the mean and the median of each data set.

  4. hill college

    in a test of the effectiveness of garlic for lowering cholesterol, 48 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

  1. college

    while a patient is having surgery,his doctor notices a small mole.The doctor doesn't think the mole is anthing to worry about,but he decides to remove it to perform a biopsy.What is the doctor guilty of?

  2. health

    What is a doctor’s responsibility if a patient requests restrictions on the use of his or her PHI? A. The doctor must comply with the patient’s wishes. B. The doctor need not comply with the patient’s wishes if HIPAA would

  3. 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,

  4. college biology

    Why LDL is considered the bad cholesterol and HDL the good cholesterol

You can view more similar questions or ask a new question.