A random sample of size 121 is taken from a population; the sample standard deviation is 22. the upper bound of 95%confidence interval is 50, what is the value of sample mean?

Q: A random sample of size n=16 is drawn from a population having a normal distribution. The mean and…

A: Given information Sample size n = 16 Mean x̅ = 23.8 Standard deviation s = 3.2 98 percent confidence…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Population standard deviation, sigma is 60.The z-critical value for 95% confidence interval is…

Q: Find the critical values, χ L 2 and  χ R 2, used for a 95% confidence interval for the standard…

A: Given: Degree of freedom = 25 α = 1 - 0.95 = 0.05

Q: How large a sample should be selected to provide a  95% confidence interval with a margin of error…

A: The formula for the  sample size is as follows: Here, zα/2 is the critical value at 95% confidence…

Q: Find a 90% confidence interval for the population standard deviation if you are given a sample of 10…

A: Given data : sample size,n = 10 df=n-1= 9 sample standard deviation,s= 3.0…

Q: A quality control manager wants to be sure that the standard deviation of oil containers is below a…

A: Let Xi be the amount of oil in the ith container,i=1,2,...,n.

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: 10. The average salary of college graduates who have taken a statisti distributed with a population…

A: Given that: n= 36.0 , x̄= 45600.0 s= 6000.0 At 95.0 % confidence level , z score= 1.96 So, 95.0 %…

Q: 2. The width of a confidence interval estimate for a population mean when the population standard…

A: The confidence interval estimate for a population mean when population standard deviation σ is,…

Q: Find the margin of error for the confidence interval of population proportion. Lower bound  0.135.…

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Population standard deviation, sigma is 50. The z-critical value for 95% confidence interval is…

Q: Why do you need to consider the studentized version of x to develop a confidence-interval procedure…

A: We consider the studentized version of x to develop a confidence-interval procedure for a population…

Q: A simple random sample of size n is drawn. The sample​ mean, x​,is found to be 17.7​, and the sample…

A: The random variable X is normally distributed. The sample mean is 17.7. The sample standard…

Q: A random sample of 10 items is taken from a normal population. The sample had a mean of 82 and a…

A: Given: Sample size, n=10 Sample mean, x¯=82Sample sd, s=26Confidence level =99%

Q: A sample of size n = 10 is drawn from an approximately normal population whose standard deviation is…

A: Givensample Mean(x)=50.9standard deviation(σ)=12.5sample size(n)=10Confidence interval = 99%

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

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Q: Find a 90% confidence interval for the mean of a normal distribution if population variance is 4 and…

A: Given CL = 0.90 Population variance, σ2=4 Sample size, n=8 9,14,10,12,7,13,11,12

Q: A random sample of 100 observations produced a mean x̅ =38.5 and a standard deviation of 3.2. find a…

A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…

Q: A simple random sample with n = 54 provided a sample mean of 22.5 and a sample standard deviation of…

A: According to the provided information, The 90% confidence interval can be calculated as:…

Q: A consumer magazine has conducted a simple random sample of 15 owners of a certain automobile and…

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

Q: A random sample of size 61 has sample mean 8 and sample standard deviation 4.2. Find a 99%…

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Q: A sample of size n = 20 is drawn from an approximately normal population whose standard deviation is…

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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: The average score for 100 teenagers playing a certain computer game was 80,000 points per player. If…

A: Here we need to construct a 68% confidence interval for the mean score of all teenagers. Given…

Q: Calculate a 90% confidence interval for the mean of the population, supposed normal, from which…

A: Given, Heights 63 63 66 67 68 69 70 70 71 71 Let X be height of  animal…

Q: For a given week, a random sample of 30 hourly employees selected from a very large number of…

A: The provided data is, n=30x¯=180s=14 The confidence level is 95%. The level of significance = 1 –…

Q: A Industrial Psychology test was written. From a sample of 50 students and it was found that the…

A:

Q: Nine hundred (900) high school freshmen were randomly selected for a national survey. Among survey…

A: Given Sample size n=900, sample mean x̄=2.7, sample standard deviations s=0.4

Q: What sample size is needed to estimate a population mean within t 70 of the true mean value using a…

A: According to the provided information, Population standard deviation (σ) = 140.625 Confidence level…

Q: Find a 95% confidence interval for the variance when a random sample of size 10 is taken from a…

A: From the given information, the sample size is 10 and the sample variance is 16.00. Given that the…

Q: The confidence level for the upper confidence bound of the populati with unknown standard deviation…

A: Let X be a random variable following normal distribution with mean μ and variance σ2, i.e.,…

Q: According to a survey, the average times, in minutes, it took for Statistics students to complete…

A: Given data; Mean(x-bar) = 102 minutes Standard deviation (s) = 11 minutes Sample size (n) =16 As…

Q: Suppose that the true population standard deviation (this assumption is made only for this question,…

A:

Q: A sample with 45 observations is taken. The mean is found to be 25, while the population standard…

A:

Q: A random sample of 120120 observations produced a mean of x¯=35.7 from a population with a normal…

A: Sample mean = x̅ = 35.7     Sample size = n = 120     Population S.D = σ = 2.37     Standard…

Q: According to a survey, the average times, in minutes, it took for Statistics students to complete…

A: we have given that  n=25 ,xbar=106 ,s=10  We need to construct the 95% confidence interval for the…

Q: A random Sample of 55 students has a text score with x̄ =78.5 Assume the population standard…

A: Confidence interval give a range of values for the unknown parameter of the population. The width of…

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: What value of z would you use to calculate the 98% confidence interval for a population mean, given…

A:

Q: A sample from a normal population is given with mean 54 and the standard deviation 12. Find the…

A: Given : n = 25 x¯=54 S = 12

Q: In a study it was found out of a random sample of 30 there was a sample standard deviation of 2.4.…

A:

Q: How large a sample should be selected to provide a  95% confidence interval with a margin of error…

A: It is given that the confidence level is 95% and the margin of error is 1. Assumed population…

Q: Construct a 95% confidence interval for the population standard deviation σ if a sample of size 10…

A: Solution

Q: A sample of size n=56 is drawn from a population whose standard deviation is 4.5 Find the margin of…

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given dataStandard deviation = 20Confidence interval = 0.95Significance level(α) = 1- 0.95 = 0.05n =…

Q: A sample size of 100 from a population having a standard deviation =8 produced a mean of 40. The 99%…

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

Q: Find the 90% confidence interval for the variance and standard deviation of the ages of students at…

A: Confidence interval: The (1-α) % confidence interval for population standard deviation is given by:

Q: For a random sample of 36 items and a sample mean of 211, compute a 95% confidence interval for u if…

A: According to the given information, we have Population standard deviation = 23 Sample size = 36…

Q: Construct a 99% confidence interval for the population standard deviation σ if a sample of size 11…

A: Confidence Interval: A confidence interval, in statistics, refers to the probability that a…