MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 2.9 mm, how many of these components should she consider to be 90% sure of knowing the
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- An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 2.3 mm, how many of these components should she consider to be 99% sure of knowing the mean will be within ±0.2±0.2 mm? 23 4642 878 30 716arrow_forwardAn engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 2.3 mm, how many of these components should she consider to be 99% sure of knowing the mean will be within ±0.4±0.4 mm? 220 179 23 15 1161arrow_forwardFor a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 39 beats per minute, the mean of the listed pulse rates is x = 78.0 beats per minute, and their standard deviation is s = 13.1 beats per minute. %3D a. What is the difference between the pulse rate of 39 beats per minute and the mean pulse rate of the females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the pulse rate of 39 beats per minutes to a z score. d. If we consider pulse rates that convert to z scores between - 2 and 2 to be neither significantly low nor significantly high, is the pulse rate of 39 beats per minute significant? a. The difference is beats per minute. (Type an integer or a decimal. Do not round.)arrow_forward
- A medical staff who knows statistics is concerned with the weights of babies. What's the minimum sample size needed to be 97% confident that the true mean is within 2.1 ounces of the sample mean? The standard deviation of the weights is known to be 7 ounces.arrow_forwardIdentify the symbols used for each of the following: (a) sample standard deviation; (b) population standard deviation; (c) sample variance; (d) population variance. If sample data consist of weights measured in grams, what units are used for these statistics and parameter a. The symbol for sample standard deviation is b. The symbol for population standard deviation is c. The symbol for sample variance is d. The symbol for population variance is If sample data consist of weights measured in grams, then correctly complete the following sentences. a. The unit for sample standard deviation would be b. The unit for population standard deviation would be C. The unit for sample variance would be ▼ d. The unit for population variance would be ▼ Carrow_forwardTo compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a safety engineer conducts braking tests for 35 models of Make A and 35 models of Make B. The mean braking distance for Make A is 42 feet. Assume the population standard deviation is 4.7 feet. The mean braking distance for Make B is 45 feet. Assume the population standard deviation is 4.4 feet. At a = 0.10, can the engineer support the claim that the mean braking distances are different for the two makes of automobiles? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) rari rz (b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is/are (Round to three decimal places as needed. Use a comma to separate answers as needed.)arrow_forward
- An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 3.8 mm, how many of these components should she consider to be 80% sure of knowing the mean will be within ±0.2±0.2 mm? 8562 38 256 25 593arrow_forwardThe temperature reading from a thermocouple placed in a constant-temperature medium is normally distributed with mean u, the actual temperature of the medium, and standard deviation o. n USE SALT What would the value of o have to be to ensure that 95% of all readings are within 0.8° of µ? (Round your answer to four decimal places.) You may need to use the appropriate table in the Appendix of Tables to answer this question.arrow_forwardWhat is the population standard deviation using the following formulaarrow_forward
- Solve this problem to find the sample standard deviationarrow_forwardPlease solve only only the last question.arrow_forwardAn engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 3.4 mm, how many of these components should she consider to be 99% sure of knowing the mean will be within ±0.5±0.5 mm?arrow_forward
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