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 3 points with 99 % confidence assuming s equals 11.5 based on earlier studies? Suppose the doctor would be content with 90 % confidence. How does the decrease in confidence affect the sample size required?

LOADING... Click the icon to view a partial table of critical values. ( 0.05 1.645)

A 99% confidence level requires how many subjects?

Level of Confidence, | (1minus−alphaα)times•100% | Area in Each Tail, StartFraction alpha Over 2 EndFractionα2 | Critical Value, z Subscript alpha divided by 2zα/2 | |

90% | 0.05 | 1.645 | ||

95% | 0.025 | 1.96 | ||

99% | 0.005 | 2.575 |

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 3 points with 99 % confidence
assuming s equals 10.1 based on earlier studies? Suppose the doctor
would be content with 95 % confidence. How does the decrease in
confidence affect the sample size required?
Show your work
Level
of Confidence,
(1minus−alphaα )times• 100%
Area in Each Tail, StartFraction alpha Over 2 EndFractionα2...

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 HDL cholesterol of all 20- to
29-year-old females. How many subjects are needed to estimate the
HDL cholesterol within 4 points with 99 % confidence assuming σ=
10.1? 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 how many 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=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 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=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?

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 HDL cholesterol of all 20- to
29-year-old females. How many subjects are needed to estimate the
HDL cholesterol within 22 points with 99% confidence assuming
σ=11.1? 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.

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
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?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 20 minutes ago

asked 32 minutes ago

asked 43 minutes ago

asked 55 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago