What is the minimum sample size required to estimate a population mean with 95% confidence when the desired margin of error is 1.9? The population standard deviation is known to be 10.75. Multiple Choice n= 63 n= 123 n= 64 n= 122

Q: In a random sample of five mobile​ devices, the mean repair cost was ​$60.00 and the standard…

A: The summary of statistics is, x¯=60,s=11,n=5 The degree of freedom is, df=n-1   =5-1   =4 Critical…

Q: How large a sample should be selected to provide a 90% confidence interval with a margin of error of…

A:

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: What is the minimum sample size necessary to construct a 90% confidence interval for with a margin…

A:

Q: A sample of 49 managers reveals a sample mean of $45,420. The standard deviation of the samp is…

A: As the population standard deviation is not known, we will use t-distribution. The number of degrees…

Q: We take a sample of 50 people and obtain a sample mean of 147 pounds with a standard deviation of 15…

A: We have given that  Sample size n = 50 Sample mean = 147 Standard deviation = 15 90%confidence…

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A: Using Excel formula “=NORM.S.INV(1-(0.04/2))”, the critical value for 96% confidence level is…

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: In a random sample of twelve ​people, the mean driving distance to work was 21.5 miles and the…

A: Solution

Q: In a random sample of nine people, the mean driving distance to work was 25 miles the sample…

A:

Q: In a random sample of 15 ​people, the mean driving distance to work was 18.5 miles and the standard…

A:

Q: Find the Confidence interval for the true Population Mean if a sample of 50 has a mean of 26.8 and a…

A:

Q: 5. If you want to be 85% confident of estimating the population mean sampling error of +5 and the…

A: At 85% confidence level, the z value is 1.44 which can be obtained by using the standard normal…

Q: Given a sample mean of 94.3, a sample standard deviation of 8.4 and a sample size of 6, test the…

A:

Q: A weekly tabloid reported that the average income of its subscribers is $39,100. Assume this…

A:

Q: In a random sample of ten ​people, the mean driving distance to work was 18.1 miles and the standard…

A:

Q: What sample size would be needed to estimate the average body temperature of humans if you wished to…

A: Given data,E=0.1z-value at 99% confidence is Zc=2.576σ=0.6n=?

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

A:

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: In a random sample of ten people, the mean driving distance to work was 21.8 miles and the standard…

A: Given,sample size(n)=10mean(x)=21.8standard deviation(σ)=6.4α=1-0.99=0.01α2=0.005degrees of…

Q: Find the sample size necessary for an 80% confidence level with a maximal margin of error E= 0.07…

A: Given that s.d =0.34,alpha =0.2,E =0.07 ( e) n= ?

Q: 1. The average height of the students in a famous college in the city is unknown but the standard…

A: 1. The population standard deviation is 0.8, sample size is 49, and sample mean is 6.1. Computation…

Q: If all other quantities remain the same, how does the indicated change affect the minimum sample…

A: Given Information: If all other quantities remain the same, how does the indicated change affect the…

Q: A company wants to estimate the mean time (in hours) per week for an adult who uses computers at…

A:

Q: Construct a 95% confidence interval for the population mean, μ. Assume the population has a normal…

A: Construction of the test statisticXi~Nμ , O2 , i =cn , independently⇒ x  ~N μ σ2n n-1S2σ2 ~ Xn-12…

Q: If a population has standard deviation 20, what is the minimum sample size to be 95% confident that…

A: Solution: From the given information, confidence level is 0.95, σ=20 and E=4.

Q: In a random sample of six ​people, the mean driving distance to work was 23.2 miles and the standard…

A: We have given that  Sample size n =6 Sample mean = 23.2 Standard deviation =6.4

Q: For a sample of 35 items from a population for which the standard deviation is σ = 20.5, the sample…

A:

Q: Estimate the population mean by finding a 99% confidence interval given a sample of size 9, with a…

A:

Q: In a random sample of eleven people, the mean driving distance to work was 25.7 miles and the…

A: Given that, n=no. of sample=11 x=mean=25.7 s=standard deviation=4.1 Confidence interval is 99%

Q: What sample size (n=?) is necessary to get a standard error of 2, if the population standard…

A: Standard error (σx¯)=2 Population standard deviation (σ)=20 Sample size (n)=σσx¯2

Q: In a random sample of ten ​people, the mean driving distance to work was 23.2 miles and the standard…

A: Provided information is ; Sample size(n) =10  Mean(μ) = 23.2 Sample standard deviation(s) = 5.3…

Q: Determine the sample size necessary to estimate a population mean within 1 with 90% confidence given…

A:

Q: To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19…

A:

Q: In a random sample of six ​people, the mean driving distance to work was 24.3 miles and the…

A:

Q: Assume that a sample is used to estimate a population mean µ. Find the margin of error M.E, that…

A:

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

A:

Q: Find the error bound for an unknown population mean or the margin of error that corresponds to a 85%…

A: Find the error bound for an unknown population mean or the margin of error that corresponds to a 85%…

Q: A sample of 256 managers reveals a sample mean of $45,420. The standard deviation of the sample is…

A: Given: A sample of 256 managers has a sample mean of $45,420 and a standard deviation of $2,050.…

Q: In a random sample of twelve ​people, the mean driving distance to work was 18.8 miles and the…

A: From the given information we want to construct 90% confidence interval.

Q: (b) A sample of size 15 drawn from a normally distributed population has sample mean 35 and sample…

A:

Q: Find the 95% confidence interval for the variance and standard deviation of the heights of maple…

A: Construct the 95% confidence interval for the variance. Obtain the critical values. The standard…

Q: What is the minimum required sample size to make a 96% confidence interval for a population mean if…

A: Margin of error=E=2 Standard deviation=σ=12 96% confidence interval  E=Zc×σ/√n n=sample size

Q: Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many…

A: Given : Margin of error, ME = 0.007 population standard deviation, σ = 1.0…

Q: In a random sample of eleven ​people, the mean driving distance to work was 18.1 miles and the…

A: Given information Sample size (n) = 11 Sample mean x̅ = 18.1 miles Standard deviation (s) = 7.6…

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: Given: sample mean = 225 Standard deviation = 442.9413 n = 20 a. Find the margin of error using…

A: GIVEN:- Sample mean=225 standard deviation=442.9413 n=20 TO calculate the number of crimes first we…

Q: Given that the population standard deviation is 1, determine the minimum sample size needed in order…

A: Given : population standard deviation = σ = 1 margin of error = E = 0.2 level of confidence = 95% At…

Q: A sample of size 78 produced the sample mean of 16.4. Assuming the population standard deviation…

A: Givensample size(n)=78sample mean(x)=16.4standard deviation(σ)=3.3α=1-0.99=0.01α2=0.005Critical…