Assume that a sample is used to estimate a population mean u. Find the 80% confidence interval for a sample of size 52 with a mean of 60.5 and a standard deviation of 8.1. Enter your answer as an open-interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). 80% C. I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Q: Assume that a sample is used to estimate a population mean µ. Find the 99.5% confidence interval for…

A: Solution To calculate the confidence interval we will use t distribution.

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: Assume that a sample is used to estimate a population mean u. Find the 99.5% confidence interval for…

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

Q: if a sample n = 16, mean = 10.3,standard deviation is 2.6. calculate a 95% confidence interval.

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population…

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population…

A: Givenstandard deviation(σ)=12Marign of error(E)=7c=99%α=1-0.99=0.01α2=0.005zα2=z0.005=2.5758   (from…

Q: if E=0.07 and population standard deviation=0.8 then find the sample size for 99% confidence…

A: Margin of error(E)=0.07 population standard deviation(σ)=0.8 confidence level=99%

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population…

A: The provided data is,

Q: Assume that a sample is used to estimate a population mean μμ. Find the 99.5% confidence interval…

A:

Q: A study found the temperature of 125 randomly selected healthy adults averaged 98.25 F with a…

A: It is given that sample mean is 98.25 and standard deviation is 0.733.

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

A: Given : Margin of error = 5 α = 0.05 Population standard deviation = σ = 30 zα2 = z0.052 = 1.96

Q: sample of size 1045 with a mean of 33.5 and a standard deviation of 13.5 ri-linear inequality…

A: As the population standard deviation is not known, we will use t-distribution. Given: Xˉ=33.5…

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: An IQ test is designed so that the mean is 100 and the standard deviation is 25 for the population…

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

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 17 for the population…

A: Givenstandard deviaion(σ)=17Margin of error(E)=4confidence level =…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population…

A: Given information Standard deviation σ= 15 Confidence interval = 0.99 Significance level(α) = 1-…

Q: The average GRE scores of graduated students at a particular university has an unknown mean and…

A: Given,sample size(n)=1000sample mean(x¯)=500satandard deviation(s0=50degrees of…

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

A: It is given that  Sample mean = 30.4 Sample standard deviation = 7.- Sample size = 9

Q: A survey of 30 adults found that the mean age of a person’s primary vehicle is 5.6 years. Assuming…

A: A confidence interval is a type of estimate computed from the statistics of the observed data. This…

Q: How large of a sample is required for a to construct a 95% confidence interval around a mean with an…

A: It is given that  Standard deviation, σ = 95 Margin of error, E = 3

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population…

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

Q: How large of a sample is required for a to construct a 90% confidence interval around a mean with an…

A: Given information- Population standard deviation, σ = 105 Let, Confidence interval = 0.90…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population…

A: Determine the sample size n needed. Use EXCEL MEGASTAT to obtain the sample size. EXCEL MEGASTAT…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population…

A: GIVEN DATA 90% ci for meanσ = 12E  = 4 n = ?

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

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population…

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 16 for the population…

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 13 for the population…

A: We have given that,  Mean (μ) = 100,  standard deviation (σ) = 13 and confidence level = 95%  and…

Q: Assume that a sample is used to estimate a population mean μμ. Find the 95% confidence interval for…

A: Given data,n=63x=49.8σ=5.5z-value at 95% confidence is Zc=1.96

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: A normal population has a standard deviation of 10. The mean of a random sample of size 15 selected…

A: Given: Sample size (n) = 10 Population standard deviation σ=10 Confidence level = 80%

Q: 7.82 The manager of a local fitness center wants an estimate of the number of times members use the…

A: Sample size=25 Sample mean=12.5 Sample standard deviation =3.8 We have to find the 95% confidence…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population…

A: Given Information: Population standard deviation (σ) = 10 Confidence level = 90% = 0.90 Margin of…

Q: Assume that a sample is used to estimate a population mean. Find the 90% confidence interval for a…

A: The summary of statistics is, x¯=68.5,s=6.6,n=46 The degree of freedom is, df=n-1   =46-1   =45…

Q: Assume that a sample is used to estimate a population mean u. Find the 99% confidence interval for a…

A: Suppose, X follows normal distribution with mean μ and standard deviation σ. The 1001-α% confidence…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population…

A: Given data,σ=15x=100z-value at 99% confidence is Zc=2.576E=7n=?

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 14 for the population…

A: