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 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

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  1. 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.

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  2. 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?

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  3. A​ 99% confidence level requires "206" subject

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  4. 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 3 points with 99 % confidence assuming s equals 16.7 based on earlier​ studies? Suppose the doctor would be content with 90 % confidence. How does the decrease in confidence affect the sample size​ required?

    A​ 99% confidence level requires "206" Subject

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