Eight samples measuring the length of cloth are sampled from a population where the length is normally distributed with population standard deviation 0.2. Calculate 95% confidence interval for population mean based on sample of 8 observations: 4.9, 4.7, 5.1, 5.4, 4.7, 5.2, 4.8 and 5.1
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Eight samples measuring the length of cloth are sampled from a population where the length is
4.9, 4.7, 5.1, 5.4, 4.7, 5.2, 4.8 and 5.1
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- In order to investigate the relationship between mean job tenure in years among workers who have a bachelor s degree or higher and those who do not, random samples of each type of worker were taken. Sample 1 had mean value of 8.2, standard deviation of 1.3 and a sample size of 155. Sample 2 had mean value of 7.0, standard deviation of 1.5 and a sample size of 210. Construct the 90% confidence interval for the difference in the population means based on these data. "0.9506 to 1,4493" 0.9506 to 1.5593 0.8756 to 1.4493 0.1234 to 0.4321 0.7506 to 1.4493 correct option?We want to estimate the true mean number of ounces of water a high school athlete drinks each day at a 95% confidence level. A random sample of 15 athletes from a school is selected and their typical daily water consumption is reported below: 64, 72, 80, 88, 128, 128, 128, 132, 145, 155, 160, 175, 180, 200, 225 What is the value of the standard error of the mean? (When calculating, use the standard deviation of the sample rounded to 3 decimal places and then round your standard error answer to 3 decimal places.) =In a random sample of 8 people, the mean commute time to work was 34.5 minutes and the standard deviation was 7.3 minutes. A 98% confidence interval using the t-distribution was calculated to be (26.8,42.2). After researching commute times to work, it was found that the population standard deviation is 8.7 minutes. Find the margin of error and construct a 98% confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.
- A sample of size 65 gave a mean 7.4 and standard deviation as 1.6 then 95% confidence interval for population mean will be Select one: O (17.008, 17.792) O [27.008, 30.008] O (7.008, 7.792) O (9,265, 10.735)A simple random sample of 195 males was taken and their birth weights measured. The sample had a mean of 3272.8 g and standard deviation of 660.2 g. Use a 0.01 significance level to test the claim that the population mean of birth weights of males is less than 3400 g. Use the p-value method. Include a diagram of the distribution indicating important components of the question.The sales price of a special brand of cereal is believed to be normally distributed. Data were collected for a sample of 16 boxes of that brand of cereal and obtained a sample standard deviation of 0.8 OR. If the sample mean is 2 OMR then the 98% confidence interval for the population mean is
- monitor the percentage fat in hot dogs produced at a food processing plant a quality control technician randomly selects 15 hot dogs and measures the percentage fat of each. The sample data yield mean (xbar) 24.1 percent and standard deviation 0.9 percent. On the assumption that the fat content has a normal distribution a 95% confidence interval for the true mean percentage fat for all hot dogs currently being produced is about.Determine the sample size required to estimate a population mean to within 11 units given that the population standard deviation is 50. Use a confidence level of 95%. Sample Size =A sample of 100 postal employees found that the mean time these employees had worked for the postal service was eight years. Assume we know the standard deviation of the population of times postal service employees have spent with the postal service is five years. Find the 98% confidence interval for the mean time the population of postal service employees have spent with the postal service.
- 100 sheets are selected and the mean is 10.998 inches. Set up a 95% confidence interval for the population mean paper length. (a) Assuming computer paper is expected to have a standard devia- tion of 0.02 inch. (b) For a sampled data, the sample standard deviation is 0.12 inch.The barricade width of 25 glass 2-liter bottle was measured by an independent quality control engineer from Zimbabwe. The sample mean was 4.05 meters and sample standard deviation was 0.08 meter. Find a 95% lower confidence bound for mean barricade width.The diameter of holes for a cable harness is known to have a normal distribution with a standard deviation of 0.01 inches. A random sample of size 10 yields an average diameter of 1.5045 inches. Find the 99% and 95% two-tailed/two-sided confidence intervals on the mean diameter and explain the difference of the interval between the two confidence levels.
