Question

What is the minimum sample size needed to estimate a mean dollar amount of some population to within $0.50. Assume we want 90% confidence and the population standard deviation is $3?

Answer #1

What is the minimum sample size needed to estimate the mean age
of the books in a library to within 2 months with 95% confidence if
the standard deviation of the ages is thought to be about 60
months?

You wish to estimate the population mean amount of time in hours
it takes to repair a device. You want to be 90% confident that the
sample mean is within 1.25 hours of the population mean. Assume
that the population standard deviation 4.7 hours. What is the
minimum sample size needed?

Use the given information to find the minimum sample size
required to estimate an unknown population mean μ.
How many women must be randomly selected to estimate the mean
weight of women in one age group. We want 90% confidence that the
sample mean is within 2.0 lb of the population mean, and the
population standard deviation is known to be 27 lb.

The sample size needed to estimate a population mean to within
50 units was found to be 97. If the population standard deviation
was 250, then the confidence level used was:
a) 90%
b) 95%
c) 98%
d) 99%
e) None of the above.

Use the given information to find the minimum sample size
required to estimate an unknown population mean μ.
How many students must be randomly selected to estimate the mean
weekly earnings of students at one college? We want 95% confidence
that the sample mean is within $5 of the population mean, and the
population standard deviation is known to be $60.

Use the given information to find the minimum sample size
required to estimate an unknown population mean
muμ.
How many students must be randomly selected to estimate the mean
weekly earnings of students at one college? We want 95%
confidence that the sample mean is within
$22
of the population mean, and the population standard deviation
is known to be
$4343.
A.
1 comma 7761,776
B.
2 comma 5102,510
C.
1 comma 5651,565
D.
1 comma 251

Calculate the minimum sample size needed to estimate the average
salary earned by alumni with the following criteria: 95% confidence
level, sample standard deviation of $1525, and within $125.

a. Assume that a sample is used to estimate a population mean μ
. Find the 80% confidence interval for a sample of size 1101 with a
mean of 54.3 and a standard deviation of 20.4. Enter your answer as
a tri-linear inequality accurate to 3 decimal places.
b. You want to obtain a sample to estimate a population
proportion. Based on previous evidence, you believe the population
proportion is approximately p = 0.39. You would like to be 98%...

Suppose a random sample of size 11 was taken from a normally
distributed population, and the sample standard deviation was
calculated to be s = 6.5. We'll assume the sample mean is 10 for
convenience. a) Calculate the margin of error for a 90% confidence
interval for the population mean. Round your response to at least 3
decimal places. Number b) Calculate the margin of error for a 95%
confidence interval for the population mean. Round your response to
at...

Determine the sample size needed to construct a 90% confidence
interval to estimate the average GPA for the student population at
a college with a margin of error equal to 0.5. Assume the standard
deviation of the GPA for the student population is 3.0. The sample
size needed is ?

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