2. An article in the Journal of Composite Materials (December 1989, Vol. 23, p. 1200) describes theeffect of delamination on the natural frequency of beams made from composite laminates. Fivesuch delaminated beams were subjected to loads, and the resulting frequencies (in hertz) wereas follows:230.66 233.05 232.58 229.48 232.58a. Calculate a 99% two-sided confidence interval on mean natural frequency.

First we have to calculate the mean and SD of given sample of size n = 5. The critical value of t at…

Answered: Calculate a 99% two-sided confidence…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Researchers studying the spread of an insect called the hemlock woolly adelgid find that the bugs have infested 23% of a random sample of 345 hemlock trees in the study area. What's a 99% confidence interval for the population proportion of infested hemlock trees in the study area?
Asample of 14 ramdomly selected commuters in Chicago showed the average of the commuting times was 33.2 minutes. if the standard deviation was 8.3 minutes, find the confidence interval of the true mean.
FIND Za/2 FOR THE 86 % CONFIDENCE INTERVAL
A recent poll of 450 college-age students found that 270 agreed with U.S. foreign policy toward Israel. What is the corresponding 80% confidence interval? ( don't hand writing solution)
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
Construct a 95% confidence interval for the true mean of city mileage (MPG) of all cars with a manual transmission. Assume that MPG of cars with a manual transmission follows a normal distribution. Also, provide an interpretation of the confidence interval in context. Here is my work so far Manual and Automatic Transmission Total # of Cars = 1129 Total # of Automatic Trans. = 877 Total # of Manual Trans. = 252 Average (Auto) = 18.97948 Average (Manual) = 20.69841 Standard Deviation (Auto) = 8.390146 Standard Deviation (Manual) = 8.565189 Automatic Min: 8 Q1: 15 Median: 18 Q3: 21 Mode: =MAX(B2:B878) = 126 Manual Min: 11 Q1: 18 Median: 20 Q3: 24 Mode: 31
Bilirubin is a yellowish substance in your blood that forms after red blood cells break down and it travels through your liver, gallbladder, and digestive tract before being excreted. Elevated levels may indicate liver damage as your liver isn’t clearing bilirubin properly. A researcher is interested in estimating the mean Bilirubin level for a population of patients with liver disease along with its 90% confidence interval. The researcher collected data from a sample of 24 patients and found the average Bilirubin level is 86.08 with standard deviation 106. However, due to the skewness in the data, a natural logarithm of the data was performed to satisfy normality assumption required for calculating the confidence interval. The resulted 90% confidence interval for the mean Bilirubin level under the natural log transformation is (3.69,4.3). Which one of the following options best helps the researcher in making inference about the true population mean Bilirubin level? a. Based…
What value of z-alpha/2 is used in a 90% confidence interval for the population mean?
State the assumptions for computing a confidence interval on the difference between means?
A laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 226 milligrams withs = 17.9 milligrams. Construct a 98% confidence interval for the true mean cholesterol content of all such eggs
The general form of a confidence interval is inferred as
Suppose that a garage samples 21 customers. They find the average time for there oil change is 4,305 miles. Find a 90% confidence interval of the true mean, if the population standard deviation is 1,151. What is the upper bound of the confidence interval? (round to the correct integer)

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