A company selling a new type of laptop battery advertises that it has a méan lifetime of 5 years.If you were in charge of quality control at the factory, which one of the following standarddeviations of battery life spans would you prefer?2 months.O 2 yearsO 5 years27

Solution:-To make an informed decision about the preferred standard deviation of battery life spans,…

Answered: A company selling a new type of laptop…

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 particular fruit's weights are normally distributed, with a mean of 380 grams and a standard deviation of 12 grams.The heaviest 9% of fruits weigh more than how many grams?Give your answer to the nearest gram.
Most water treatment facilities monitor the quality of their drinking water on an hourly basis. One variable measured is pH, which measures the degree of alkalinity or acidity in the water. A pH below 7.0 is acidic, one above 7.0 is alkaline, and a pH of 7.0 is neutral. One water-treatment plant has a target pH of 8.5. (Most try to maintain a slightly alkaline level) The mean and standard deviation of 1 hour’s test results based on 49 water samples at this plant are: = 8.42; s = 0.16 Does this sample provide sufficient evidence that the mean pH level in the water differs from 8.5? do in excel if needed
The mean ae (at inauguration) of all U.S. Presidents is approximately Normally distributed with a mean of 54.6 Barack Obama was 47 when he was inaugurated, which is the 11th percentile of the distribution. Which of the following is closest to the standard deviation of presidents' ages? a. -9.20 b. -6.18 c. 6,18 d. 7.60 e. 9.20 .
National park services, a bureau of the US government responsible for park management, is interested in how the scores of their park rangers today are better or worse than in the past. The cognitive test that the forest rangers take as remained the same over the last five years. Below are the scores for each year, compute the mean, median, mode, range, and standard deviation for each year. Current Year 56, 45, 64, 75, 87, 81, 69, 81, 58, 92, 99, 95, 75, 92, 73, 83, 47, 69, 57, 74, 62, 74, 73, 100, 83 Five Years Ago 66, 78, 75, 79, 59, 74, 55, 89, 55, 79, 68, 27, 69, 95, 68, 90, 65, 79, 69, 79, 87, 86, 98, 81, 96
Lecture(10.9A): The Peabody Picture Vocabulary Test has a standard score population mean of 100 and a standard deviation of 15. You tested a class of Grade 2 students wondering if their scores are different from the population. After testing these hypothesis you grouped the children based on whether the oldest, middle, or youngest. Here is a summary of the grouped data. Oldest child: 87 ,84, 98, 104, 106, 91,96, 92, Middle child: 65, 74, 62, 60, 73, 64, 71,78 Youngest child: 115, 84, 85, 83, 95, 94, 108, 102, 89 Perform AVOVA post Ad Hoc (Bonfeirri correction) in Excell.
As a chemical engineer working for a tire manufacturer, you collect the following data in order to test the performance of tires. Plot the data and calculate the mean and standard deviation. Kilometers with Acceptable (Reliable) Frequency Wear 30,000 15 35,000 20 40,000 34 45,000 32 50,000 22 55,000 16
DATAfile: Costco You may need to use the appropriate technology to answer this question. Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of ? = 13 is expected. In 2012, Costco, with its 432 warehouses in 40 states, was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores follows. 95 90 83 75 95 98 80 83 82 93 86 80 94 64 62 (a) What is the sample mean customer satisfaction score for Costco? (b) What is the sample variance? (Round your answer to two decimal places.) (c) What is the sample standard deviation? (Round your answer to two decimal places.) (d) Construct a hypothesis test to determine whether the population standard deviation of ? = 13 should be rejected for Costco. With a 0.05 level of significance, what is your conclusion?…
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Which of the following would be the most reasonable estimate for the weight of house cats? (The population would be all house cats in the U.S., and the variable would be each cat's weight.) A. Mean = 10 pounds, standard deviation = 0 pounds. B. Mean = 10 pounds, standard deviation = 2 pounds. C. Mean = 10 pounds, standard deviation = 10 pounds. D. Mean = 2 pounds, standard deviation = 10 pounds.
We considered the differences between the temperature readings in January 1 of 1968 and 2008 at 51 locations in the continental US in Exercise 5.19. The mean and standard deviation of the reported differences are 1.1 degrees and 4.9 degrees respectively. see attachment
Tips given to taxi drivers form a substantial part of their income. They also serve as a loose metric of service quality that can be useful for taxi companies. An analysis of a large dataset shows that the tips given (as a percentage of taxi fares) are normally distributed with mean 21.3% and standard deviation 7.5%. Furthermore, tips received for different trips are independent from each other. taxi driver expects to do 2000 trips next year. For approximately how many of these trips will he receive a tip over 25%?
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A company selling a new type of laptop battery advertises that it has a méan lifetime of 5 years. If you were in charge of quality control at the factory, which one of the following standard deviations of battery life spans would you prefer? O 2 months O 2 years O 5 years