Question

What is the best point estimate for the population's standard deviation if the sample standard deviation is 8.98.9? Round your answer to one decimal place, if necessary.

Answer #1

point estimate of population standard deviation = sample standard deviation = 8.9

What is the best point estimate for the population's variance if
the sample variance is 38.4? Round your answer to one decimal
place, if necessary.

A population's distribution is normal with a mean of 18 and
standard deviation of 4. A sample of 16 observations is selected
and a sample mean computed. What is the probability that the sample
mean is more than 18?

A sample of 22 items provides a sample standard deviation of
6.
(a)
Compute the 90% confidence interval estimate of the population
variance. (Round your answers to two decimal places.)
________ to _________
(b)
Compute the 95% confidence interval estimate of the population
variance. (Round your answers to two decimal places.)
________ to _______
(c)
Compute the 95% confidence interval estimate of the population
standard deviation. (Round your answers to one decimal place.)
________ to _________

Assume that a sample is used to estimate a population mean μμ
with population standard deviation σ=σ= 19.4. Find the 80%
confidence interval for a sample of size 577 with a mean of 21.5.
Enter your answer as a tri-linear inequality accurate to 1 decimal
place.

Calculate the sample variance and sample standard deviation for
the following frequency distribution of heights in centimeters for
a sample of 8-year-old boys. If necessary, round to one more
decimal place than the largest number of decimal places given in
the data.
Heights in Centimeters
Class
Frequency
116.1 - 120.0
35
120.1 - 124.0
33
124.1 - 128.0
39
128.1 - 132.0
48
132.1 - 136.0
14
What is the sample variance and sample standard deviation?

Using the sample standard deviation as an estimate for the
population standard deviation, what size sample should the manager
choose if she wishes to estimate the mean number of admissions per
24-hour period to within 1 admission with 99% reliability?

A population has a mean of 161.2 and a standard deviation of
9.6. A sample of size 13 is taken from this population. What is the
standard deviation of the sampling distribution of the
mean? Enter your answer to 3 decimal places.
We have two random variables, A and B. A has a mean of 89.6 and
a standard deviation of 37.7. B has a mean of 23.6 and a standard
deviation of 15.1. If we create a new random variable...

The following sample data are from a normal population: 8, 6,
10, 13, 11, 9, 4, 3.
(a)
What is the point estimate of the population mean?
(b)
What is the point estimate of the population standard deviation?
(Round your answer to three decimal places.)
(c)
With 95% confidence, what is the margin of error for the
estimation of the population mean? (Round your answer to one
decimal place.)
(d)
What is the 95% confidence interval for the population mean?...

A psychologist wants to estimate the standard deviation of IQ
scores. It is widely believed that IQ scores follow a normal
distribution. Her random sample of 25 IQ scores has a mean of 97.4
and a standard deviation of 17.2. Find the 99% confidence interval
for the population standard deviation based on this sample. Then
complete the table below. Carry your intermediate computations to
at least three decimal places. Round your answers to at least two
decimal places. (If necessary,...

A psychologist wants to estimate the standard deviation of IQ
scores. It is widely believed that IQ scores follow a normal
distribution. Her random sample of
25
IQ scores has a mean of
99
and a standard deviation of
13.2
. Find the
99%
confidence interval for the population standard deviation based
on this sample. Then complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your answers to at least two decimal places. (If...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 59 seconds ago

asked 8 minutes ago

asked 22 minutes ago

asked 53 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 1 hour ago

asked 2 hours ago