Q4 A sample of 80 rivets manufactured by a company has mean diameter 1.52 cm. estimate...
A random sample of 34 observations is used to estimate the population mean. The sample mean is 104.6 and the sample standard deviation is 28.8. What is the Upper Confidence Limit for a 95% confidence interval for the population mean? Round your answer to 1 decimal place.
Assume that a sample is used to estimate a population mean u. Find the 80% confidence interval for a sample of size 947 with a mean of 72.1 and a standard deviation of 10.5. Enter your answer as a tri-linear inequality accurate to 3 decimal places. < <
Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence interval for a sample of size 457 with a mean of 66.5 and a standard deviation of 13.4. Enter your answer as a tri-linear inequality accurate to 3 decimal places. ____ < μ < ____
*without using interval functions on calculator* 26. Birth Weights A simple random sample of birth weights in the United States has a mean of 3433 g. The standard deviation of all birth weights is 495 g a. Using a sample size of 75, construct a 95% confidence interval estimate of the mean birth weight in the United States. b. Using a sample size of75,000, construct a 95% confidence interval estimate of the mean birth weight in the United States. c....
Q4. [8 marks] The mean μ of the tear strength of a certain paper is under consideration. A sample of size 30 was collected with sample mean 2.4 pounds (a) [4] If the standard deviation of an individual measurement is known to be σ-: 0.2, find a 95% confidence interval for μ. b) l4l if the standard deviation σ is unknown but the sample standard deviation is s-0.2, determine a 95% confidence interval for μ
A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is σ =15 . a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places. ( , )
Eighteen bearings made by a certain process have a mean diameter of 0.75 cm with standard deviation of 0.05 cm. Need to use T-distribution. find 95% confidence interval for the actual average diameter of bearings made by this process. find 90% confidence interval for the actual average diameter of bearings made by this process.
The standard deviation of the diameter of rivet heads manufactured by a factory is estimated to be 0.15mm. Given a sample with size 50 and sample mean 18.45mm, what is the upper limit of the confidence interval of the distribution mean with confidence level 98%?
A random sample of 49 observations is used to estimate the population variance. The sample mean and sample standard deviation are calculated as 59 and 3.1, respectively. Assume that the population is normally distributed. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Construct the 90% interval estimate for the population variance. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence interval b. Construct the...
4 .A random sample of the birth weights of 24 babies has a mean of 3103 grams and a standard deviation of 696 grams. Construct a 95% confidence interval estimate of the mean birth weight for all such babies. if possible include graph