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

44

points
with
99 %99%

confidence
assuming
s equals 18.9s=18.9

based
on earlier studies? Suppose the
doctor would be content with
95 %95%

confidence.
How does the decrease in confidence affect the sample
size required?
A 99% confidence level requires 149149 subjects. (Round up
to the nearest subject.)

A 95 %95% confidence level requires 8686 subjects. (Round up
to the nearest subject.)

How does the decrease in confidence affect the sample size
required?

A.

The sample size is the same for all levels of
confidence.

B.

Decreasing the confidence level decreases the sample size
needed.

C.

Decreasing the confidence level increases the sample size
needed.

what is the answer.... A,B or C?

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 2 points with 99 % confidence
assuming s equals 13.4 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 90% 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
2
points with
99%
confidence assuming
s=17.8
based on earlier studies? Suppose the doctor would be content
with
95%
confidence. How does the decrease in confidence affect the
sample size required?
LOADING...
Click the icon to view a partial table of critical values.
A 99% confidence level requires
nothing
subjects. (Round up to...

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=13.3 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 90% 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 3 points with 99% confidence assuming S=19.2
based on earlier studies? suppose the doctor would be content with
90% confidence. How does the decrease in confidence affect the
sample size required?
1. A 99% confidence level requires __ subjects (round up to
the nearest subject)
2. 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 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 equals 16.7s=16.7 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 99% confidence level requires blank subjects.
A 95 %95% confidence level requires blank 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 33 points with 99 %99% confidence
assuming s equals 11.2s=11.2 based on earlier studies? Suppose the
doctor would be content with 95 %95% confidence. How does the
decrease in confidence affect the sample size required? A 99%
confidence level requires ____subjects. 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 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 ?...

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