Question

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 sigma equals 15.2 question mark σ=15.2? 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 90% confidence level require

Answer #1

Solution :

Given that,

Population standard deviation = = 15.2

Margin of error = E = 2

**(a) 99%**

Z_{/2}
= 2.576

sample size = n = [Z_{/2}*
/ E] ^{2}

n = [2.576 * 15.2/ 2]^{2}

n = 384

A 99% confidence level requires 384

(b) **90%**

Z_{/2}
= 1.645

sample size = n = [Z_{/2}*
/ E] ^{2}

n = [1.645 * 15.2/ 2]^{2}

n = 157

A 90% confidence level requires 157

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 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 % confidence assuming sigma
equals 15.7 question mark 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 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 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 sigma
equals 12.7 question mark Suppose the doctor would be content with
95 % confidence. How does the decrease in confidence affect the
sample size required?
99% and 95%

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 HDL cholesterol of all 20- to
29-year-old females. How many subjects are needed to estimate the
HDL cholesterol within
33
points with
99 %
confidence assuming
sigma equals 10.8 question markσ=10.8?
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
nothing
subjects.
(Round up to the nearest whole number as needed.)

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 sigma
equals 11.4 question mark 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 nothing
subjects. (Round up to the nearest whole number as needed.) A 95
% confidence level requires...

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 3 points with 99 % confidence assuming sigma
equals 13.5 question mark 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 nothing
subjects. (Round up to the nearest whole number as needed.) 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 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 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
?=15.4?
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 whole number as needed.)

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 41 seconds ago

asked 35 minutes ago

asked 38 minutes ago

asked 38 minutes ago

asked 40 minutes ago

asked 43 minutes ago

asked 51 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago