Make one set of example and solution for both Estimation for population mean: When standard deviation is known and Estimation for population mean: When standard deviation is unknown
Make one set of example and solution for both Estimation for population mean: When standard deviation...
Make one set of example and solution for both Estimation for population mean: When standard deviation is known and Estimation for population mean: When standard deviation is unknown
4. Interval estimation of a population mean, population standard deviation unknown The Business Environment and Enterprise Performance Survey (BEEPS), developed by the European Bank for Reconstruction and Development and the World Bank, is a survey of more than 4,000 firms in 22 transition countries. Conducted in 2000, BEEPS gathered information on the impediments to business growth in transition countries. As part of BEEPS, firms answered the question, "How many days does it take to transfer money through the financial system...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
A population data set is right-skewed and has a mean of 100 and a standard deviation of 5. Which of the following is true regarding the sampling distribution of the mean for a sample size of 1,000? Select one: It's standard deviation is 5. It's shape is right-skewed It's standard deviation is 0.158. It's mean is 10.
99 and standard deviation σ A population whose distribution is unknown has mean μ and a sample of size 26 is drawn from this population, then 1, a. The mean oJ a b. The standard error ot c. The distribution of A population whose distribution is unknown has mean μ = 99 and standard deviation σ = 7 and a sample of size 26 is drawn from this population, then 1, a. b. c. The mean of X= The standard...
10 When you are calculating an estimation interval, you use the normal distribution if ... (1 point) (put the letter of the correct answer in the red box) a b the population standard deviation is known. the population standard deviation is not known. 11 When you are calculating an estimation interval, you use the t-distribution if. (1 point) (put the letter of the correct answer in the red box) the population standard deviation is known. the population standard deviation is...
one can calculate the 95% confidence interval for the mean with the population standard deviation knowing this gives us an upper and lower confidence limit what happens if we decide to calculate the 99% confidence interval describe how the increase in the confidence level has changed the width of the confidence interval the same for the confidence interval set at 80% including example with actual numeric value for the intervals and you're supposed to help with your explanations
C) the standard deviation of the population is known D) both the underlying population is normal and the sample size n 30 are correct II. Calculation Questions. (2 points) 5. A random sample of size n=50 is taken from a population with mean μ =-9.5 and standard deviation 2. Calculate the expected value and standard error for the sampling distribution of the sample mean. What is the probability that the sample mean is less than -10? a. b. c. What...
The population mean is $51,300 and the population standard deviation is $5,000. When the sample size is n=20 , there is a .3472 probability of obtaining a sample mean within +/- $500 of the population mean. Use z-table. a. What is the probability that the sample mean is within $500 of the population mean if a sample of size 40 is used (to 4 decimals)? b. What is the probability that the sample mean is within $500 of the population...
1. A sample of 64 results in a sample mean of 33. The population standard deviation is known to be 8. The hypothesize population mean is 35. Do you want to test one of the population mean is actually less than 35 at the 0.05 significance level. what is the value of the z-statistic? what is the p-value?