Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise.An article in the ASCE Journal of Energy Engineering ("Overview of Reservoir Release Improvements at 20 TVA Dams," Vol. 125, April1999, pp. 1-17) presents data on dissolved oxygen concentration from streams below 20 dams in the Tennessee Valley Authority system.The sample mean from the observations is I = 3.293 and the sample standard deviation is s = 2.129. Assume population isapproximately normally distributed.Round your answers to 2 decimal places.(a) Calculate the 95% two-sided confidence interval on the mean oxygen concentration.ii(b) Calculate the 95% two-sided prediction interval on the dissolved oxygen concentration for the next stream that will be tested.i< Xn+1 3i(c) Find an interval that will contain 95% of the values of the dissolved oxygen concentration with 99% confidence.ii

There are 20 dams in Tennessee valley x¯=3.293s=2.129 a) Confidence interval at 95% : The t…

Answered: An article in the ASCE Journal of…

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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A variable is normally distributed with mean 32 and standard deviation 12. Use the Cumulative Z-Score Table to answer the following questions. Write your answers in decimal form using 4 decimal places. a) Find the area under the normal curve to the left of the data value 16.4. b) Find the area under the normal curve to the left of the data value 52.4. c) Find the area under the normal curve to the right of the data value 27.2. d) Find the area under the normal curve to the right of the date value 37.4, e) Find the area under the normal curve between the data values 37.4 and 52.4.
5. Old Faithful is a famous geyser at Yellowstone National Park. From a sample of 40 eruptions, the mean duration of Old Faithful eruptions is 3.7 minutes, and the standard deviation is 1.2 minutes. Find the percent of eruptions that have lasted from 1.3 minutes to 6.1 minutes.
A survey found that women's heights are normally distributed with mean 62.7 in. and standard deviation 2.6 in. The survey also found that men's heights are normally distributed with mean 68.4 in. and standard deviation 3.3 in. Most of the live characters employed at an amusement park have height requirements of a minimum of 56 in. and a maximum of 63 in. Complete parts (a) and (b) below. a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park? The percentage of men who meet the height requirement is 5.08 %. (Round to two decimal places as needed.) Since most men do not meet the height requirement, it is likely that most of the characters are women. b. If the height requirements are changed to exclude only the tallest 50% of men and the shortest 5% of men, what are the new height requirements? The new height requirements are a minimum of in. and a maximum of (Round to…
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