As part ofa water quality survey, you test the water hardness in several randomly selected streams. The resuts are shown below Construct a confidence interval forthe population variance oand the population standard devistion e. Use a 0N level of confidence. Assume that the population has a namal datrbution.16 grains per galonWhat is the confidenoe interval for the populaton variance e?O0 Rand to ore decinal place as eded)Interpret the . Select the comect choice below and in the anser bonjes) te complete your choice(Raund to one decimali places needed.)OA We so% coridence, t can be said that he populatian varianoOB. Win 10% confidence, itcan be said that the population variance is greaterOe we sON contdence, t can be said that the populetion variance isbetween andOD. Win 10% confidenon, can be said that the population variance isbetweenandWhat is the confidence interval tor the population standard deviation a?OO Roundo one deial place needed)Interpret the resuts. Select the coect chole belo(Round to one decimal places asnin the answer boxfes to complete your choliceWih e ensO ene vnonuiaion atendant deion

The given data is as follows:Sample size, Sample standard deviation, Confidence level,

Answered: As part of a water quality survey, you…

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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Planning engineers want to construct a confidence interval for the standard deviation of the runtime of a certain manufacturing process (0), assuming that the runtimes will be approximately Normal. They make 25 random observations and find that, on average, the process takes 290 seconds, with a sample standard deviation of 35 seconds. Click here to view page 1 of the table of critical values of the chi-squared distribution. Click here to view page 2 of the table of critical values of the chi-squared distribution. With 90%, the engineers can conclude that o will be between and| (Round to two decimal places including any zeros.)
* Question Completion Status: OC. 0.0099 d. 0.0918 QUESTION 3 EPA fuel economy estimates for automobile models tested recently predicts a mean of 24 mpg and a standard deviation of 6 mpg. Assume that a Normal model applies, N(24, 6 ). What mpg for the automobiles would be the cutoff value for the lowest 10% of the mpg's (the 10th percentile of gas mileage)? O a. 12.80 mpg O b. 10.00 mpg O c. 31.38 mpg O d. 16.32 mpg QUESTION 4
Page 2 of 21 8. Selling Cars: You sell a brand of automobile tire that has a life expectancy that is normally distributed with a mean life of 30,000 miles and a standard deviation of 2500 miles. You want to give a guarantee for free replacement tires if the tires wear out too soon, but you can only afford to give free replacements on approximately 5% of the tires you sell. How should you word your free replacement guarantee? Draw, shade and label a normal curve to illustrate your results.
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if your data is not normally distributed, to describe dispersion you should use: O standard deviations O standard deviations based on a median quartiles O modes
Medication used to treat a certain condition is aministered by syringe. The target dose ina particular application is 10 milligrams. Because of the variations in the syringe, in reading the scale, and in mixing the fluid suspension, the actual dose administered is normally distrubuted with a mean of 10 milligreams and a standard deviation of 1.6 milligrams. What is the probablility of that the dose administered is between 9 and 11.5 milligrams? Find the 98th percentile of the adninisterd dose. If clinical overdose is defined as a dose larger that 15 milligrams, what is the probablility that a patient will receive an overdose.
eBook The U.S. Energy Information Administration (US EIA) reported that the average price for a gallon of regular gasoline is $3.87. The US EIA updates its estimates of average gas prices on a weekly basis. Assume the standard deviation is $.24 for the price of a gallon of regular gasoline and recommend the appropriate sample size for the US EIA to use if they wish to report each of the following margins of error at 95% confidence. Round up to the next whole number. a. The desired margin of error is $.09. The appropriate sample size is b. The desired margin of error is $.06. The appropriate sample size is c. The desired margin of error is $.05. The appropriate sample size is
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