The compressive strength of concrete is being tested by an engineer who tested 12 specimens andobtains the following data:221622372249220422252301228122632318223722812295Construct a 99% two-sided confidence interval on the mean strength. Construct a 99% upperconfidence bound on the mean strength. Compare this bound with the upper bound of the two-sidedconfidence interval. Include your solutions.

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Answered: Construct 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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During a routine check of the fluoride content of Gotham City's water supply, the given results were obtained from replicate analyses of a single sample: 0.513 mg/L0.513 mg/L , 0.487 mg/L0.487 mg/L , 0.511 mg/L0.511 mg/L , 0.489 mg/L0.489 mg/L , and 0.519 mg/L0.519 mg/L . Determine the mean and 90% confidence interval for the average fluoride concentration in this sample. Report the mean and the confidence interval with three significant figures.
The amniotic fluid analysis of a simple random sample of 15 pregnant women showed the following measurements in the total protein present in grams per 100 ml. 0.69 1.04 0.39 0.37 0.64 0.73 0.69 1.04 0.83 1.00 0.19 0.61 0.42 0.20 0.79 Build a 95% confidence interval for population variance in the measurements of the total protein present in the amniotic fluid of pregnant women.
In monitoring lead in the air after an explosion at a battery factory, it is found that the amount of lead (in ug/m3) over a 6 day period had a standard error of 2.57. Find the margin of error that corresponds to a 95% confidence interval.
In a sample of 40 water specimens taken from a construction site 26 contained detectable level of lead. An 80% confidence interval for the proportion of water specimens that contains detectable levels of lead is
Determinations of saliva pH levels were made in two independent random samples of seventh-grade schoolchildren. Sample A children were caries-free while sample B children had a high incidence of caries. The results were as follows: A 7.14 7.11 7.61 7.98 7.21 7.16 7.89 7.24 7.86 B 7.36 7.04 7.19 7.41 7.10 7.15 7.36 7.57 7.19 Construct and interpret a 90% confidence interval for the difference between the population means.
A Harris Poll in 2003 asked a national sample of 2316 adults whether they favored or opposed abolishing the penny, with 59% saying that they oppose it. Determine and interpret a 90% confidence interval for the population parameter of interest. (4 decimals)
During a laboratory analysis of human blood composition, tests are repeated and are known to be normally distributed. Fifteen tests on a given sample of blood yielded the following values1.003 1.01 1.03 1.045 1.0061.024 1.019 1.009 1.014 1.0211.031 1.08 1.058 1.012 1.001 Calculate the 98% confidence interval for true composition of the blood in repeated tests of the sample.b) Data on investments in the high-tech industry by venture capitalists are compiled by VentureOne Corporation. A random sample of 16 venture capital investments in the fiber optics business sector yielded the following data, in millions of dollars. 5.60 6.27 5.96 10.51 2.04 5.48 5.74 5.588.63 5.95 6.67 4.21 7.71 9.21 4.98 8.64 Determine a 99% confidence interval for the mean amount, μ, of all venture-capital investments in the fiber optics business sector. Assume that the population standard deviation is $1.98 million.
Use the Data Below: A) A potential car buyer is undecided on whether to buy a 2012 car with a front-wheel-drive (F) or with a rear-wheel-drive (R). Obtain the fuel efficiency mean, standard deviation, and the number of observations included in the sample for each type of these systems. B) Construct and interpret a 95% confidence interval for the true difference inmean city mileage (MPG) between front wheel drive (F) and rear wheel drive (R) systems. Assume that MPG of front wheel drive and rear wheel drive cars follow a normal distribution. *Note: You can use Excel or Rstudio or any means necessary comb_mpg drive_sys 13 R 16 R 16 R 15 R 16 R 27 R 27 R 19 R 21 R 19 R 18 R 19 R 17 R 18 R 12 R 23 R 25 R 24 R 17 R 14 R 26 R 26 R 23 R 22 R 16 R 16 R 36 R 36 R 22 R 21 R 21 R 20 R 21 R 24 R 22 R 23 R 22 R 23 R 22 R 24 R 22 R 23 R 22 R 23 R 22 R 15 R 13 R 14 R 13 R 15 R 19 R 17 R 17 R…

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Construct a 99% two-sided confidence interval on the mean strength. Construct a 99% upper confidence bound on the mean strength. Compare this bound with the upper bound of the two-sided confidence interval. Include your solutions.