Question

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

22

points with

99 %99%

confidence assuming

s equals 15.1s=15.1

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?

Answer #1

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 33 points with 99 %99% confidence
assuming s equals 16.6s=16.6 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?

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 13.7 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 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 2 points with 99 % confidence
assuming s equals 13.7 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 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 4 points with 99 % confidence
assuming s equals 14.5 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 ____ subjects. (Round up to
the nearest subject.)

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 4 points with 99 % confidence
assuming s equals 14.5 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 90% confidence level requires ____ subjects. (Round up to
the nearest subject.)

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 22 points with 99 % confidence
assuming s equals 13.7 based on earlier studies? Suppose the
doctor would be content with 95 % confidence. How does the decrease
in confidence affect the sample size required?
a) A 99% confidence level requires _____subjects.
b) A 95 % confidence level requires _____ subjects.

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% confidence assuming s=10.8 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 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 4 points with 99 % confidence
assuming s equals 15.6 based on earlier studies? Suppose the
doctor would be content with 95 % confidence. How does the decrease
in confidence affect the sample size required?

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 22 points with 99% confidence
assuming s equals 11.9 based on earlier studies? Suppose the
doctor would be content with 95% confidence. How does the decrease
in confidence affect the sample size required?
A 99% confidence level requires ? subjects (please answer the
question mark for both)
A 95% confidence level requires ?...

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 4 points with 99%
confidence assuming s=19.1 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?

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