The energy storage system is an important part of any electric car. An electric carcompany has decided to replace their batteries with a new type and want to examinetwo types of batteries for its new vehicles: Lithium-ion and Lead-acid batteries. Dueto the critical role of lifespan in the energy storage system, the company randomlyselected 10 samples from each type and ran an accelerated life test to obtain thelifetime of each battery type. The measured lifespan is illustrated in the table below:Lithium-ionLead-acid365370366358369362364364363357365355364366365359369355362356(a) Test the hypothesis that the mean lifespan of the two battery types are equal.Use a = 0.01 and assume equal variances.(b) Find the P-value for this test.

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Answered: The energy storage system is an…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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A team of undergraduate business students was asked to recommend improvement to the data entry process at the county appraiser’s office. The team identified several types of errors, such as posting an incorrect name or entering an incorrect parcel number. The deed abstractors were asked to keep a record of the errors in data entry that were sent to them. The following table is a frequency distribution of errors: Defect Total Posting error in name Posting error in parcel Property sold after tax bills were mailed Inappropriate call transfer (not part of deeds>mapping) Posting error in legal description>incompletelegal description Deeds received after tax bills printed Correspondence errors Miscellaneous errors 23 21 5 18 4 6 2 1 a. Construct a Pareto diagram of these defects in data entry.b. What recommendations would you suggest to the county appraiser?
Study B: The decoy effect is the phenomenon that an additional but worse option can boost the appeal of an existing option. In order to get workers at food-processing factories in China to comply with hygiene standards (i.e., using hand sanitizer every hour), researchers manipulated whether there were additional options to the standard and convenient spray bottle provided to each employee. Workers in different rooms were randomly assigned to have just the standard spray bottle, or the standard spray bottle and an inconvenient squeeze bottle. Quality control personnel kept track of hand sanitizer use (weighing the bottles before and after each shift) and sanitary condition (sample wipes assessing the number of bacteria on hands). Neither the employees or quality control personnel were aware of the experiment or its hypothesis. The researchers found that when a decoy was present, workers used more sanitizer and were more likely to pass hand sanitary tests. In this example, it was…
Post Covid-19 will inevitably change the expectations of the customer in relation to restaurant service. Watch the advertisement ( https://www.youtube.com/watch?v=QX64tBjRkwM&t=11s) of the country’s number one fast food chain, Jollibee in going beyond the extra mile to ensure the safety of its customers while continuing to deliver quality food and service. Read also reopening guidelines of hotels and restaurants in Florida, USA and react whether the guidelines can be applied to the establishments in our country. In your opinion and observation, what are the "now normal" strategies in the restaurant service? How did the staff interact with the guest?
The following data was recorded while observing the increase in the number of butterflies in two different ponds, Pond A and Pond B. Number of Butterflies Present Over 5 Years Year Pond A Pond B 0 50 65 85 1 2 3 4 5 100 O 110 121 133 146 161 110 143 186 What is the rate of growth, r, for each pond and which pond has the fastest average rate of growth over the five years? TA = 1.1, TB = 1.3, mg = 3.72 butterflies/yr TA=0.9, TB=0.8, mg = 3.72 butterflies/yr TA=0.9, TB=0.8, mg=27.2 butterflies/yr TA = 1.1, TB = 1.3, mg=27.2 butterflies/yr
The chart below is a summary of the main results of a test data set representing the population observed purchasing a virtual digital assistant. What does the accuracy rate indicate? Metrics Metric Value Accuracy (#correct) 178 Accuracy (%correct) 85.6 Specificity 0.88219 Sensitivity (Recall) 0.6 Precision 0.82400 F1 Score 0.88213 Success Class 1 Success Probability 0.4 Multiple Choice 85.6% of the population has purchased a virtual assistant. 60% of the observations are correctly classified. 85.6% of the observations are correctly classified. 14.4% of the observations are correctly classified. Explain all the incorrect answers also
Problem 5 Madras Medical College is trying to improve its image providing a positive experience for its patients and their relatives. Part of the "image" program involves providing tasty, inviting patient meals that are also healthful. A questionnaire accompanies each meal served, asking the patient, among other things, whether he or she is satisfied or unsatisfied with the meal. A 100-patient sample of the survey results over the past 7 days yielded the following data: June through December and the MAD and January. The initial the end of December. What can you say about the performance or Day 1 Sample size 100 100 100 100 100 100 100 Construct p-chart that plots the percentage of patients unsatisfied with their meals. Set the control limits to include 99.73% of the random variation in meal satisfaction. Comment on your results. 2 3 4 5 6 7 No. of unsatisfied patients 24 22 8 15 10 26 17
Explain the use of full and fractional factorial experimental designs. Provide a scenario of when it would be appropriate for each.
A student group on a college campus wanted to create a survey about parking availability on campus. The student group randomly selected 300 students to take the survey. One of the questions read, “Many students believe the lack of available parking is a major problem. Do you agree or disagree?” Of the 300 students that took the survey, 285 surveys were returned. This survey will most likely suffer from which of the following types of bias? There is no bias in the way this survey is carried out. Response bias Selection bias Non-response bias
In response to intensive foreign competition, the management of Florex Company has attempted over the past year to improve the quality of its products. A statistical process control system has been installed and other steps have been taken to decrease the amount of warranty and other field costs, which have been trending upward over the past several years. Costs relating to quality and quality control over the last two years are given below: Costs (in thousands) Last Year This Year Inspection $ 720 $ 909 Quality engineering $ 450 $ 765 Depreciation of test equipment $ 675 $ 270 Rework labor $ 1,080 $ 1,530 Statistical process control $ 0 $ 225 Cost of field servicing $ 1,350 $ 1,260 Supplies used in testing $ 45 $ 81 Systems development $ 720 $ 900 Warranty repairs $ 3,780 $ 1,620 Net cost of scrap $ 630 $ 1,170 Product testing $ 900 $ 1,800 Product recalls $ 3,150 $ 900 Disposal of defective products $ 810 $ 1,080 Sales have been flat over the…
When observations can be placed into oneof two categories. Examples include items(observations) that can be classified asa. Good or badb. Pass or failc. Operate or don’t operate
The number of yearly breakdowns for the power generator observed over the past 20 years at Orlando Utilities is presented in the following data: Number of breakdowns 0 1 2 3 4 5 6 Number of years in which breakdowns occurred 3 3 5 3 4 1 1 For Orlando Utilities, the expected number of breakdowns = (round your response to two decimal places).
A manager tracked equipment failures and found 1 failure on 12 days, 2 failure on 11 days, 3 failures on 9 days, and 4 failures on 7 days. What is the 2-decimal mean? What is the 2-decimal standard deviation?

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