For a data set obtained from a random sample, n = 81 and x = 48.25. It is known that σ = 4.8. a. What is the point estimate of μ? b. Make a 95% confidence interval for μ. c. What is the margin of error of estimate for part b

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Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence interval for a sample of size 55 with a mean of 85.5 and a standard deviation of 21.5. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.a. 80% C.I. = The answer should be obtained without any preliminary rounding

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The standard deviation for a population is o = 15.2. A sample of 25 observations selected from this population gave a mean equal to 143.55. The population is known to have a normal distribution. Round your answers to two decimal places. a. Make a 99% confidence interval for u. i i b. Construct a 95% confidence interval for u. (i i c. Determine a 90% confidence interval for u. i i d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?

A simple random sample with n = 52 provided a sample mean of 24.0 and a sample standard deviation of 4.6. a. Develop a 90% confidence interval for the population mean (to 1 decimal). b. Develop a 95% confidence interval for the population mean (to 1 decimal). c. Develop a 99% confidence interval for the population mean (to 1 decimal). d. What happens to the margin of error and the confidence interval as the confidence level is increased? V - Select your answer - They increase They decrease They stay the same It cannot be determined from the given data The margin of error increases and the confidence interval becomes narrower The margin of error decreases and the confidence interval becomes wider

Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence interval for a sample of size 46 with a mean of 15.6 and a standard deviation of 10.2. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.80% C.I. = The answer should be obtained without any preliminary rounding.

For the provided sample​ mean, sample​ size, and population standard​ deviation, complete parts​ (a) through​ (c) below. Assume that x is normally distributed.   x=31 n=9 σ=6   a. Find a​ 95% confidence interval for the population mean.   The​ 95% confidence interval is from _______ to __________. ​(Round to two decimal places as​ needed.)   b. Identify and interpret the margin of error.   The margin of error is ___________ ​(Round to two decimal places as​ needed.)   Interpret the margin of error. Choose the correct answer below.   A. We can be​ 95% confident that the population​ mean, μ​, is within the margin of error of the sample​ mean, 31.   B. We can be​ 95% confident that any possible value of the variable is within the margin of error of the sample​ mean, 31.   C. We can be​ 95% confident that any possible value of the variable is within the margin of error of the population​ mean, μ.   D. We can be​ 95% confident that any possible sample mean is within the…