5. If you want to be 85% confident of estimating the population mean sampling error of +5 and the standard deviation is assumed to be 15, what sa required?

Q: 5. A hospital would like to conduct a study to investigate the mean birth weight of children born at…

A: Givenstandard deviation(σ)=12Margin of error(E)=2confidence…

Q: Assuming that IQ is normally distributed with a mean of 100 and a standard deviation of 15, describe…

A: According to central limit theorem, for large sample (>30) or if the population follows normal…

Q: The chancellor wants you to calculate the largest sample size needed with a margin error of 5% and…

A: Given information- Population standard deviation (σ) = 12 Error (E) = 5 minutes The margin of error…

Q: If you want to be 99% confident of estimating the population mean to within a sampling error of ± 5…

A:

Q: If you want to be 99​% confident of estimating the population mean to within a sampling error of ±25…

A: The provided information’s are:Standard deviation (σ) = 125.Sampling error (E) = ±25Confidence level…

Q: An advertising executive wants to estimate the mean weekly amount of time consumers spend watching…

A: Margin of error is the error due to random sampling. The margin of error decreases with an increase…

Q: 3. To compare the braking distances for two types of tires, a safety engineer conducts 35 braking…

A:

Q: 2. The head of a school clinic in a certain elementary school wants to estimate the mean height (in…

A: Given that alpha =0.05,s.d =30 ,M.E = 4

Q: What is the minimum sample size required to estimate a population mean with 95% confidence when the…

A: We have given that,  Margin of error (E) = 1.6 and population standard deviation (σ) = 10.65 and…

Q: What is the minimum sample size required to estimate a population mean with 95% confidence when the…

A: Given, standard deviation, σ = 10.75 margin of error, E = 1.9

Q: 2. Given a standard deviation of 3.7, what is the mean if1 0% of the population has a distribution…

A: We have given that,  Let x be the random variable from normal distribution with standard deviation…

Q: Suppose the number of dollars spent per week on groceries is normally distributed. If the population…

A: Given information: Population standard deviation, σ is 7 dollars. Margin of error, E is 3 dollars.…

Q: Find the minimum sample size needed to be ninety seven percent confident that the true mean is…

A: Given,margin of error(E)=2.3standard deviation(σ)=7.3α=1-0.97=0.03α2=0.015Z0.015 =2.1701

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean…

A:

Q: If you want to be 99% confident of estimating the population mean to within a sampling error of ±20…

A:

Q: 7. A researcher wants to estimate the mean income of all physicians in a city at a 95% confidence…

A: Given,standard deviation(σ)=17500margin of error(E)=5000α=1-0.95=0.05α2=0.025Z0.025=1.96    (from…

Q: 1. Suppose that we want to estimate to within $1000 the mean salary of all graduates who were…

A: Given,margin of error(E)=1000standard deviation(σ)=5000α=1-0.95=0.05α2=0.025z0.025=1.96

Q: If the population standard deviation is 10, how large a sample is necessary to have a standard error…

A: The population standard deviation is 10 and the standard error is less than 5 points.

Q: If you want to be 99% confident of estimating the population mean to within a sampling error of ±6…

A: Obtain the sample size needed.   The sample size needed is obtained below as follows : Use EXCEL…

Q: How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters?…

A: Solution: It is given here that the confidence level is 95% The margin of error, E = 3 The…

Q: 16. In a standardized test with a normal distribution of scores, the mean is 63 and the standard…

A: here use normal curve property and value near to center in curve have more chance to occur

Q: If you want to be 95% confident of estimating the population mean to within a sampling error of +6…

A:

Q: How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters?…

A:

Q: If you want to be 99% sure confident of estimating the population mean to within a sampling error of…

A: The critical value from the standard normal table at 99% confidence level is,

Q: 11 What sample size is needed to give a margin of error of ±9 in estimating a population mean with…

A:

Q: If you want to be 99​% confident of estimating the population mean to within a sampling error of ±6…

A: Given that Population SD = 16 Error, E = 6 Confidence level = 99% The critical value of Z at 99%…

Q: The population standard deviation for the heights of dogs, in inches, in a city is 5.7 inches. If we…

A:

Q: A positively skewed population has a mean of μ= 150 and a standard deviation of σ= 10. What is the…

A: Solution: From the given information, µ = 150 and σ = 10.

Q: if a population has a mean  of 75 and a standard deviation of 15    (a) what is the mean of the…

A: Given,sample size(n)=25mean(μ)=75standard deviation(σ)=15

Q: The mean score on the exit examination for an urban high school is 66with a standard deviation of…

A: Given  μ=66, σ=6, n=9  We want to find the sample mean(x̄)

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: An advertising executive wants to estimate the mean weekly amount of time consumers spend watching…

A:

Q: If you want to be 95​% confident of estimating the population mean to within a sampling error of ±20…

A: Given information- Population standard deviation, σ = 100 Confidence interval = 0.95 Significance…

Q: 4. What is the range of data values that would allow 99% of the fall within the mean? 5. Why does…

A: “Since you have mentioned the question number 4 and 5, we will solve that question for you. If you…

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean…

A: From the provided information, Standard deviation (σ) = 0.04 Confidence level = 95%

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.53.…

A:

Q: Determine with appropriate calculations if you agree or disagree with the statement that “Less than…

A: Given that  By empirical rule  68% of a data from a normal distribution lies within 1 standard…

Q: 1. When conducting a hypothesis test for the population mean, you will not know the population…

A: The process will remain unchanged but the distribution. As,  you know the sample standard deviation.…

Q: The chancellor wants you to calculate the sample size needed with a margin of error of 5, 90%…

A: Using Excel formula “=NORM.S.INV(1-(0.10/2))”, the critical value for 90% is obtained as 1.645.

Q: The Chancellor wants you to calculate the sample size needed with a margin of error of 15, 99%…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: Calculate the standard error for a sample mean when the population standard deviation is 250.1 and…

A: here given population standard deviation,σ=250.1 sample size , n=10,823   formula for standard…

Q: If you want to be 95% confident of estimating the population mean to within a sampling error of ±3…

A: Given that, Critical values: Using the z-table, the critical value at 95% confidence level for a…

Q: I am confidant that the mean starting salaries of all my econ students is $60,000. If i am right,…

A:

Q: 11- Assuming that IQ is normally distributed with a mean of 100 and a standard deviation of 15,…

A: NOTE: According to the guidelines, we are supposed to solve first question only. Please repost other…

Q: If you want to be 95​% confident of estimating the population mean to within a sampling error of ±4…

A: We are interested in the finding sample size for the given margin of error and confidence level.

Q: What would be the mean of the sampling distribution of all possible sample means obtained from this…

A: Given: μ=5σ=4

Q: If the standard error of the sample mean is 5, for samples of size 25, what is the popu lation…

A: