After plotting demand for four periods, an emergency room manager
has concluded that a trend-adjusted exponential smoothing model is appropriate to predict future demand. The initial estimate of trend is based on the net change of 30 for the three periods from 1 to 4, for an average of +10 units.
Period Actual Period Actual
1 210 6 265
2 226 7 279
3 221 8 283
4 240 9 281
5 256 10
Use α=.5 and β=.1, and TAF of 250 for period 5. Obtain forecasts for periods 6 through 10. (Round intermediate calculations and final answers to 2 decimal places.)
t Period TAFt
6 ?
7 ?
8 ?
9 ?
10 ?
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A mail-order house uses 17,410 boxes a year. Carrying costs are 60
cents per box a year, and ordering costs are $96. The following price schedule applies.
Number of Boxes Price per Box
1,000 to 1,999 $1.25
2,000 to 4,999 1.20
5,000 to 9,999 1.15
10,000 or more 1.10
Determine the optimal order quantity. (Round answer to the nearest whole number.)
Determine the number of orders per year.
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A producer of inkjet printers is planning to add a new line of printers,
and you have been asked to balance the process, given the following task times and precedence relationships. Assume that cycle time is to be the minimum possible.
Task Length(minutes) Immediate Predecessor
a 0.2 –
b 0.4 a
c 0.3 –
d 1.3 b, c
e 0.1 –
f 0.8 e
g 0.3 d, f
h 1.2 g
Enter the number of following tasks for each of the tasks shown in the table below
Task Number of Following Tasks
a.
b
c
d
e
f
g
h
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As part of a major plant renovation project, the industrial engineering
department has been asked to balance a revised assembly operation to achieve an output of 240 units per eight-hour day. Task times and precedence relationships are as follows:
Task Duration(minutes) Immediate Predecessor
a 0.2 –
b 0.4 a
c 0.2 b
d 0.4 –
e 1.2 d
f 1.2 c
g 1.0 e, f
Determine the minimum cycle time, the maximum cycle time, and the calculated cycle time.
The minimum cycle ? time minutes per unit
The maximum cycle time ? minutes per unit
Calculated cycle time ? minutes per unit
Determine the minimum number of stations needed
Minimum number of stations ?
Compute the percentage of idle time for the assignment in part d. Use the actual bottleneck cycle time in calculation.
Percentage of idle time ? %
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job was timed for 60 cycles and had an average of 1.2 minutes per
piece. The performance rating was 91 percent, and workday allowances are 11 percent. Determine each of the following:
Observed time. (Round answer to 1 decimal place.)
Normal time. (Round answer to 2 decimal places.)
Standard time. (Round answer to 2 decimal places.)
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A time study was conducted on a job that contains four elements. The
observed times and performance ratings for six cycles are shown in the following table.
Determine the average cycle time for each element. (Round answers to 3 decimal places.)
Find the normal time for each element. (Round to 3 decimal places
Assuming an allowance factor of 13 percent of job time, compute the standard time for this job. (Round answers to 3 decimal places.)
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The manager of a fashionable restaurant open Wednesday through
Saturday says that the restaurant does about 30 percent of its business on Friday night, 31 percent on Saturday night, and 15 percent on Thursday night. What seasonal relatives would describe this situation?(Round your answers to 2 decimal places.)
Wednesday Thursday Friday Saturday
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This week you will explore Quality systems, quality control, inspection,
quality tools, and quality management. Your assignment this week is to first choose an industry segment with which you are familiar. That business can be the one in which you are employed or are familiar with with such as: airline transportation; food services; retail outlets; pharmacies, medical or dental services; or any other business you are familiar with. Once you have decide on an industry segment (not a company), research online the following questions:
-What factors are important to a high quality product or service in this industry segment?
-What quality problems or issues has this industry had challenges with in the past?
-How does this industry generally manage the quality of products and services?
-What are your general perceptions of the quality of products and services in this industry segment?
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A company manufactures a product using machine cells. Each cell has
a design capacity of 250 units per day and an effective capacity of 230 units per day. At present, actual output averages 200 units per cell, but the manager estimates that productivity improvements soon will increase output to 223 units per day. Annual demand is currently 60,000 units. It is forecasted that within two years, annual demand will triple. How many cells should the company plan to acquire to satisfy predicted demand under these conditions? Assume that no cells currently exist. Assume 236 workdays per year. (Round up your answer to the next whole number.)
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Problem 5-6 a. Cost for Plan A $ ____________
A real estate agent is considering changing her cell phone plan. There are three plans to choose from, all of which involve a monthly service charge of $20. Plan A has a cost of $.43 a minute for daytime calls and $.18 a minute for evening calls. Plan B has a charge of $.53 a minute for daytime calls and $.15 a minute for evening calls. Plan C has a flat rate of $80 with 250 minutes of calls allowed per month and a charge of $.40 per minute beyond that, day or evening.
Determine the total charge under each plan for this case: 140 minutes of day calls and 60 minutes of evening calls in a month. (Do not round intermediate calculations. Round your answer to 2 decimal places. Omit the “$” sign in your response.)
Cost for Plan B $ ____________
Cost for Plan C $ ____________
c.If the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal? (Round each answer to the nearest whole number.Include the indifference point itself in each answer.)
Plan A is optimal from zero to___________ minutes. Plan C is optimal from ___________ minutes onward.
d.Suppose that the agent expects both daytime and evening calls. At what point (i.e., percentage of total call minutes used for daytime calls) would she be indifferent between plans A and B? (Do not round intermediate calculations. Enter your answer as a percentage rounded to 2 decimal places. Omit the “%” sign in your response.)
Point ____________ percent daytime minutes
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