4.21. The following sample data was obtained. Whatis the expected ±3 sigma spread of the process,assuming normal distribution?16.2116.2316.1616.1416.16 16.1616.1116.0816.1616.1816.1516.1516.2016.18 16.13 16.1416.1716.22 16.1516.1516.14 16.2016.2016.13a. 16.158±0.108b. 16.200 0.072c. 16.173 ± 0.036d. 16.158 1.0804.22. A distribution for time-to-failure processescharacterized by a failure rate that does not varywith time is:a. Weibullb. Gemma16.1016.1316.1716.1016.1716.18c. Lognormald. Exponential4.23. Which of the following indicates an out-of-control condition?4.25. In the binomial expression:a. A trend of 5 points in an upward ordownward directionb. 5 consecutive points either above or belowthe center linec. 2 of 3 consecutive points outside the 2-sigma warning limitsd. No points outside the 3-sigma limitsa. 125 hoursb. 22 hoursc. 27 hoursd.hours4.24. A reliability test was terminated after acombined total of 171 device-hours based upona pre-established time terminated plan. Anestimate of mean-time-to-failure (0) of 57 hourswas obtained. The lower 95 percent confidencebound on the true population mean-time-to-failure is:a. The sum of the exponents of each term afterexpansion is equal to the sample sizeb. The sum of the coefficients of each termafter expansion is equal to the sample sizec. The sum of the exponents of all the termsafter expansion is equal to the sample sized. The sum of the exponents after expansionhas no relation to the sample size4.26. A music group has 7 members. How manysubgroups of 4 members can be formed fromthe music group?a. 35b. 424.27. The MTBF of equipment is 5000 hours.Assuming a constant failure rate, its chance tofail in 5000 hours of operation is:a. 63%b. 37%a. 0.01b. 0.054.28. If the probability density function of somemeasurements is found to be 0.02X for Xs in theinterval of 0 to 10, what is the probability that ameasurement will be between 4 and 574.29. Given:c. 210d. 840f(x) =c. 100%d. 50%15Then X has a mean and a standard deviation of:a. 5,5b. 5, 1c. 1,5d. 0,1a. 0.998b. 0.9998c. 0.9999d. 0.999MacBook Airc. 0.09d. 0.204.30. The length of life of a transistor is exponentiallydistributed with a failure rate of 0.002 failuresper 10,000 hours. The reliability of the transistorfor 1,000 hours is:for x ≥ 0CONCEPTS

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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 teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers: SAMPLE 1234 4.54.64.54.7 4.24.54.64.6 4.24.44.44.8 4.34.74.44.5 4.34.34.64.9 If the process parameters are unknown, estimate its mean and standard deviation. (That is, find the average and standard deviation of all data points at once.) Select one: O a. O b. c. O d. e. f. x_bar = 4.7, s = 0.0368 g. x_bar = 4.3, s = 0.19 x_bar = 4.7, s = 0.19 x_bar = 4.3, s= 0.0368 x_bar = 4.5, s = 0.0368 x_bar = 4.5, s = 0.19 None of the other options.
2. The following data for a random sample of banks in Los Angeles and New York City represent the ATM fees for using another bank's ATM. Los Angeles 2.00 1.50 1.50 1.00 1.50 2.00 0.00 2.00 New York City 1.50 1.00 1.00 1.25 1.25 1.50 1.00 0.00 Source: www.bankrate.com Compute the range and sample standard deviation for ATM fees for each city. Which city has more dispersion based on the range? Which city has more dispersion based on the standard deviation?
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