1. A sample of size n = 121 produced the sample mean of 30. Assuming the population standard deviation o = 4, compute a 95% confidence interval for the population mean µ.

Q: Given the population mean, mu = 10,321, and a population standard deviation sigma = 736, for a…

A: Introduction: The sampling distribution of the sample mean, X̄, based on a sample of size n, taken…

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Q: 2. A sample of 38 data observations has a sample mean 0.0328. If an experimenter wishes to use a…

A: Given  n=38, Xbar=0.0328, sigma=0.015 and alpha=0.01 Zcritical=2.578 at alpha=0.01

Q: 1.  Find the critical value tc for the confidence level c=0.98 and sample size n=22. tc= round to…

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A: Following information is given: standard deviation = 30 minutes sample size = 75

Q: a. develop a 95% confidence interval for the difference between two population means b. Is there…

A: n1 = 28n2 = 30 x1 = 24x2 = 22 s1 = 8s2 = 6

Q: For samples of the specified size from the population described, find the mean and standard…

A: As per guidelines expert have to answer first question only..

Q: A. Find the length of the following confidence interval. 1.0.241 < p < 0.653 2. Upper confidence…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A random sample of n measurements was selected from a population with standard deviation σ=17.8 and…

A: Given,population standard deviation(σ)=17.8α=1-0.95=0.05α2=0.025Z0.025=1.96    (from Z-table)

Q: 1. A sample of size n = 121 produced the sample mean of = 30. Assuming the population standard…

A: Note: Please repost remaining questions as i can answer only 1 question as per my policy.   1) Given…

Q: A statistical research yields to the sample proportion of a certain feature in a certain community…

A: Given information: The sample proportion is p=0.56. The margin of error is ME=0.05. The confidence…

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Q: Given the following hypotheses: 3 Ho: μ- 590 H:H+ 590 A random sample of 15 observations is selected…

A: 3. a. The degrees of freedom is, df=n-1=15-1=14 The degrees of freedom is 14. The significance level…

Q: he population standard deviation is σ=2σ=2, determine the minimum sample size needed in order to…

A: The sample size can be calculated as: n=z×σE2 Here, z = desired confidence level E = The allowable…

Q: Using a confidence level of 95% and a population standard deviation of 24, what is the minimum…

A: Given : Margin of error, ME = 10.0 population standard deviation, σ = 24.0…

Q: 1. A sample size of n=12 with population standard deviation ở= 16 at 99% confidence level. 2. A…

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Q: A sample of size n = 81 produced the sample mean of = 50. Assuming the population standard deviation…

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Q: 10) A simple random sample of kitchen toasters is to be taken to determine the mean operational…

A: Given:Population standard deviation = σ = 20Margin of error = E = 8Confidence level = 0.98Therefore,…

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Q: A sample of 20 observations shows a sample mean of 290 and a sample standard deviation of 30.…

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Q: 5) Consider a confidence level of 87%, let E = 0.02 and p = 0.42. Find the sample size n. %3D

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Q: Calculate the 95% confidence interval for the difference (mu1-mu2) of two population means given the…

A: Given : Population 1 :   n= 6,mean=17.62,s.d=3.25 Population 2 :  n=17,mean=15.57,s.d=2.47

Q: We want to determine the mean weight of a certain type of fish. If we also want to estimate u to…

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

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Q: Consider a normal population with µ = 50 and σ = 6. A sample size of at least which size needs to be…

A: The population standard deviation is 6 and margin of error is 2 or less.

Q: 4. A sample size of n= 40, X= 123 with population standard deviation o = 36 at 90% confidence %3D…

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Q: sample of size 12 drawn from a normally distributed population has a sample mean 38.7 and a sample…

A: We have given that  Sample size n =12 Sample mean = 38.7 sample standard deviation =14.9. 99.9%…

Q: Given two independent random samples with the following results: ni = 8 x1 = 98 s1 = 11 n2 = 12 X2 =…

A: Given : x̄1 = 98 x̄2 = 121

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

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Q: 1. Find the minimum sample size (n) you use to so that p is within a margin of error of 3% with a…

A: Sample size = sample size is the number of completed responses your survey receives or (randomly…

Q: 2. (10%) Given a sample with s = 8.5 and n = 21. Estimate the population standard deviation with 90%…

A: Since you have asked multiple questions we will solve the first question for you. If you want any…

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Q: 3. What sample size is needed for to give the desired margin of error in estimating a population…

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Q: Suppose X is a normal population with the mean D and standard deviation O = 15. A sa of size 25…

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Q: Given the population mean, mu = 67, and a population standard deviation sigma = 24.1, for a sample…

A: Given Information: Mean (u) = 67  Standard deviation ( σ ) = 24.1 Sample size (n) = 244

Q: In determining the sample size necessary to estimate a population mean, which of the following…

A: The formula to compute the sample size using the margin of error is: Sample sizen=Zα2×σE2 Zα2 is the…

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A: Critical value: Using Excel formula “=T.INV.2T(0.02,19)”, the critical value for 98% confidence…

Q: 1. A sample of size n = 121 produced the sample mean of ī = 30. Assuming the population standard…

A: As per guideline expert have to answer first question only.

Q: A random sample of nn measurements was selected from a population with standard deviation σ=17.9 and…

A: (a) Obtain the 99% confidence interval for the population mean. The 99% confidence interval for the…

Q: Find a 90% confidence interval for                < U < (b) Find a 95% confidence interval for…

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Q: Suppose x has a mound-shaped distribution witho = 3. Find the minimal sample size required so that…

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Q: 1. A sample of size n = 121 produced the sample mean of = 30. Assuming the population standard…

A: (1)   Obtain the 95% confidence interval for the population mean. The 95% confidence interval for…

Q: ple mean of 75, population standard deviation of 5, and n = 100, Estimate the mean of the population…

A: AS the population standard deviation is known, we will use z -distribution. The critical z-value for…

Q: For the specified margin of​ error, confidence​ level, and educated guess for the observed​ value,…

A: Zα/2 = 1.645  at α = 0.1 _____________________________ Use Excel function =NORMSINV(0.05) OR Z-…

Q: A simple random sample of size n=51 is taken from a normally distributed original population. The…

A: (1-α)% CI for σ is(n-1)s2χ2α/2,n-1≤σ≤(n-1)s2χ21-α/2,n-1

Q: A random sample of 130 observations produced a mean of T = 23.5 and a standard deviations = 2.16.…

A: Given:   Sample size  n          =  130       mean  x¯               =  23.5 Standard deviation s  =…