A city planner wants to estimate, with a 95% confidence level, the average monthly residential water...
A city planner wants to estimate, with a 95% confidence level, the average monthly residential water usage in the city. Based on earlier data, the population standard deviation of the monthly residential water usage in this city is 387.90 gallons. How large a sample should be selected so that the estimate for the average monthly residential water usage in this city is within 110 gallons of the population mean? Round your answers to the nearest integer. n= please respond in steps on how to compute
Homework Answers
Sample size = (Z
/2 * 
/
E)2
= (1.96 * 387.90 / 110)2
= 47.77
Sample size = 48 (Rounded up to nearest integer)
Add Answer to:
A city planner wants to estimate, with a 95% confidence level,
the average monthly residential water...
If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean...
If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean amount of water in a 1-gallon bottle to within ± 0.004 gallons and also assumes that the standard deviation is 0.04 gallons, what sample size is needed? (Round up to the nearest integer) If the inspection division of a county weights and measures department wants to estimate the mean amount of soft-drink fill in 2-liter bottles to within ± 0.02 liter with 90% confidence...
If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean...
If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean amount of water in a 1-gallon bottle to within ±0.003 gallons and also assumes that the standard deviation is 0.03 gallons, what sample size is needed? Round up to the nearest integer.)
If the manager of a bottled water distributor wants to estimate, with 90% confidence, the mean...
If the manager of a bottled water distributor wants to estimate, with 90% confidence, the mean amount of water in a 1-gallon bottle to within ± 0.003 gallons and also assumes that the standard deviation is 0.05 gallons, what sample size is needed? (Round up to the nearest integer.)
lf the manager of a bottled water distributor wants to estimate, with 99% confidence, the mean...
lf the manager of a bottled water distributor wants to estimate, with 99% confidence, the mean amount a water in a 1-gallon bottle to within ± 0.005 gallons and a so assumes that the standard deviation is 0.02 gallons, what sample size is needed? n-11 (Round up to the nearest integer.)
A consumer group wants to estimate the mean electric bill for the month of April for...
A consumer group wants to estimate the mean electric bill for the month of April for single-family homes in a large city. Based on studies conducted for other cities, the standard deviation is assumed to be $24. The group wants to estimate, with 99% confidence, the mean bill for April to within $4 a. What sample size is needed? b. If 95% confidence is desired, how many homes need to be selected? Click the icon to view a table of...
the national program planner for the girl scouts wants to estimate The national program planner for...
the national program planner for the girl scouts wants to
estimate
The national program planner for the Girl Scouts wants to estimate the average number of girls per troop. A random sample of 81 troops shows sample mean x = 14.8 girls with standard deviation 9.0 girls. Find a 99% confidence interval for the population mean number of girls per troop.
The water works commission needs to know the mean household usage of water by the residents...
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. they would like to estimate to have a maximum error of 0.14 gallons. a previous study found that for an average family the standard deviation is 2 gallons and the mean is 16 gallons per day. If they are using a 95% level of confidence, how large of a sample is required to estimate the mean...
A city planner wants to construct a confidence interval for the proportion of workers who would...
A city planner wants to construct a confidence interval for the proportion of workers who would take public transportation to work if it were available. What sample size should he use to estimate the proportion to within 4 percentage points at a 90% level of confidence?
The water works commission needs to know the mean household usage of water by the residents...
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. They would like the estimate to have a maximum error of 0.14 gallons. A previous study found that for an average family the standard deviation is 1.9 gallons and the mean is 16.7 gallons per day. If they are using a 98% level of confidence, how large of a sample is required to estimate the mean...
An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional...
An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television daily. Based on previous studies, the standard deviation is assumed to be 22 minutes. The executive wants to estimate, with 99% confidence, the mean weekly amount of time to within ± 6 minutes. a. What sample size is needed? b. If 95% confidence is desired, how many consumers need to be selected? (Round up to the nearest integer.)
If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean amount of water in a 1-gallon bottle to within ±0.003 gallons and also assumes that the standard deviation is 0.03 gallons, what sample size is needed? Round up to the nearest integer.)
lf the manager of a bottled water distributor wants to estimate, with 99% confidence, the mean amount a water in a 1-gallon bottle to within ± 0.005 gallons and a so assumes that the standard deviation is 0.02 gallons, what sample size is needed? n-11 (Round up to the nearest integer.)
A consumer group wants to estimate the mean electric bill for the month of April for single-family homes in a large city. Based on studies conducted for other cities, the standard deviation is assumed to be $24. The group wants to estimate, with 99% confidence, the mean bill for April to within $4 a. What sample size is needed? b. If 95% confidence is desired, how many homes need to be selected? Click the icon to view a table of...
the national program planner for the girl scouts wants to
estimate
The national program planner for the Girl Scouts wants to estimate the average number of girls per troop. A random sample of 81 troops shows sample mean x = 14.8 girls with standard deviation 9.0 girls. Find a 99% confidence interval for the population mean number of girls per troop.
Most questions answered within 3 hours.
-
The definition of a partition
function involved a sum over all states, and knowledge of the...
asked 32 minutes ago -
Which of the following events would be considered Systematic?
(Choose all that apply.)
A. The Federal...
asked 41 minutes ago -
Questions of this part analyze the students’ understanding in
analyzing the given scenario and practical skills...
asked 48 minutes ago -
#C++
Write a function, named sortByCourseNumber, that takes a
reference to a vector of string (like...
asked 48 minutes ago -
A
cylunder of titanium (length = 5.00cm, diameter = 1.20 cm) has a
mass of 25.5...
asked 2 hours ago -
1) Answer Each question with 1-2 Sentences:
a) How can we use the continuity and change...
asked 2 hours ago -
5. What is the decimal equivalent of the largest binary
integer that can be obtained with...
asked 2 hours ago -
Why is the magnitude of the Type Ia supernova always the same
(-19.6)?
asked 2 hours ago -
5. You are a quality control engineer and you are
asked to analyze the lifetime (in hours)...
asked 3 hours ago -
How many ways can 2 people be chosen and arranged in a straight
line if there...
asked 4 hours ago -
(Problem 1d). Leandro has 16 hours per day that he can allocate
to work or leisure....
asked 4 hours ago -
Morganton Company
makes one product and it provided the following information to help
prepare the master...
asked 5 hours ago