Question

supposed in accounting firm does a study to determine the time
needed to complete one persons tax forms it randomly surveys 80
people the sample mean is 30.2 hours there is a known standard
deviation of 8.0 hours the population distribution is assumed to be
normal construct a 99% confidence interval for the population mean
time to complete the tax forms.

Sample mean

Error bound Margin

Population Standard Deviation

Confidence level

Lower and Upper Bound

Answer #1

The solution to this problem is given by

Suppose that an accounting firm does a study to determine the
time needed to complete one person's tax forms. It randomly surveys
100 people. The sample mean is 23.6 hours. There is a known
population standard deviation of 6.8 hours. The population
distribution is assumed to be normal.
Construct a 90% confidence interval for the population mean time
to complete the tax forms.
(iii) Calculate the error bound. (Round your answer to two
decimal places.)
I don't understand the error...

PROBLEM: Suppose that an accounting firm does a study to
determine the time needed to complete one person's tax forms. It
randomly surveys 200 people. The sample mean is 23.1 hours. There
is a known population standard deviation of 6.2 hours. The
population distribution is assumed to be normal.
a) Find the following. (Enter exact numbers as integers,
fractions, or decimals.)
x-bar = ______
σ = ______
n = _______
b) In words, define the random variables X and
X-bar...

Suppose that an accounting firm does a study to determine the
time needed to complete one person's tax forms. It randomly surveys
175 people. The sample mean is 22.1 hours. There is a known
population standard deviation of 6.6 hours. The population
distribution is assumed to be normal.
NOTE: If you are using a Student's t-distribution, you may
assume that the underlying population is normally distributed. (In
general, you must first prove that assumption, though.)
A. Find the following. (Enter exact...

1. Suppose that an accounting firm does a study to determine the
time needed to complete one person’s tax forms. It randomly selects
100 people. The sample mean is 23.6 hours. There is a known
population standard deviation of 7.0 hours. The population
distribution is assumed to be normal.
A. Find the margin of error associated with a 95% confidence
interval.
B. Find and interpret the 95% confidence interval for the mean
amount of time to complete a person’s tax...

The U.S. Census Bureau conducts a study to determine the time
needed to complete the short form. The Bureau surveys 200 people.
The sample mean is 8.2 minutes. There is a known standard
deviations of 2.2 minutes. The population distribution is assumed
to be normal
A) Construct a 90% confidence interval for the population mean
time to complete the forms
B) calculate the error bound
C) If the Census wants to increase its level of confidence and
keep the error...

The time it takes to complete one biology experiment is normally
distributed with known standard deviation of 20 minutes. A random
sample of 64 experiments in the science school in UCLA had a mean
time of 75 minutes. Find the standard error, margin of error, and
the upper and lower confidence limits of a 95% confidence interval
for the population mean, m.

Use the sample data and confidence level given below to complete
parts (a) through (d).
In a study of cell phone use and brain hemispheric dominance,
an Internet survey was e-mailed to 2620 subjects randomly selected
from an online group involved with ears. 1080
surveys were returned. Construct a 99% confidence interval for
the proportion of returned surveys.
USE Z SCORE TABLE
a) Find the best point estimate of the population proportion p.
_____________ (Round to three decimal places as...

In a study of cell phone use and brain hemispheric dominance,
an Internet survey was e-mailed to 2662
subjects randomly selected from an online group involved with
ears. 1018 surveys were returned. Construct a
99% confidence interval for the proportion of returned
surveys.
a) Find the best point estimate of the population proportion
p.
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
(Round to three decimal places as needed.)
c) Construct...

2. A firm would like to know the average time it takes its
employees to commute to work. The firm takes a sample of 37 workers
and finds a sample mean of 38 minutes, with a sample standard
deviation of 14 minutes. Construct a 99% confidence interval for
the population mean.
a) State the critical value:
b) Calculate the margin of error (round to the thousandths
place):
c) State the lower and upper values of the confidence
interval:

se the sample data and confidence level given below to complete
parts (a) through (d). A research institute poll asked
respondents if they felt vulnerable to identity theft. In the
poll, n equals 907 and x equals 571 who said "yes." Use a 99 %
confidence level. Find the best point estimate of the population
proportion p. Identify the value of the margin of error E.
Construct the confidence interval. ) Write a statement that
correctly interprets the confidence interval....

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