Questions
Consider the following time series. (a) Choose the correct time series plot. (i)...
Consider the following time series.
| (a) | Choose the correct time series plot. |
| (i) |  |
(ii) |  |
| (iii) |  |
(iv) |  |
| - Select your answer -Plot (i)Plot (ii)Plot (iii)Plot (iv)Item 1 |
| What type of pattern exists in the data? |
| - Select your answer - Horizontal PatternDownward Trend PatternUpward Trend PatternItem 2 |
| (b) | Use simple linear regression analysis to find the parameters for the line that minimizes MSE for this time series. |
| Do not round your interim computations and round your final answers to three decimal places. For subtractive or negative numbers use a minus sign. (Example: -300) | |
| y-intercept, b0 = | |
| Slope, b1 = | |
| MSE = |
| (c) | What is the forecast for t = 8? |
| If required, round your answer to three decimal places. | |
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To a greater or lesser degree, many governments can be considered pregmatic nationalists when it comes...
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There are four steps in the manufacturing process of a stuffed toy: cutting, stuffing, sealing, and...
There are four steps in the manufacturing process of a stuffed toy: cutting, stuffing, sealing, and packaging. There are two employees each for cutting and stuffing but one each for sealing and packaging. The processing times of cutting, stuffing, sealing, and packaging are 8, 5, 3, and 2 seconds per toy per employee.
a) What is the cycle time for stage “cutting” (in [min/unit])?
b)What is the cycle time for stage “sealing” (in [min/unit])?
c)Which stage is the bottleneck? What is the process capacity in [units/hour]?
d)If you can add one employee in parallel at the bottleneck stage, what should be the capacity of a new employee so that you increase the process capacity as much as possible?
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A production manager at a pottery factory has noticed that about 70 percent of defects result...
A production manager at a pottery factory has noticed that about 70 percent of defects result from impurities in raw materials, 15 percent result from human error, 10 percent from machine malfunctions, and 5 percent from a variety of other causes. This manager is most likely using a-
Select one:
a. cause-and-effect diagram.
b. scatter diagram.
c. quality loss function.
d. Pareto chart.
e. flowchart.
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Consider a file system that uses inodes to represent files. Diskblocks are 8 kb in size,...
Explain a little bit^^ Thank you
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Find the percentage of men meeting the height requirement
A survey found that women's heights are normally distributed with mean \(63.6\) in. and standard deviation \(3.4\) in. The survey also found that men's heights are normally distributed with mean \(69.7\) in. and standard deviation \(3.1\) in. Most of the live characters employed at an amusement park have height requirements of a minimum of 57 in. and a maximum of 64 in. Complete parts (a) and (b) below.
a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park?
The percentage of men who meet the height requirement is \(\square \%\). (Round to two decimal places as needed.)
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You're helping some security analysts monitor a collection of networked computers,
You're helping some security analysts monitor a collection of networked computers, tracking the spread of an online virus. There are n computers in the system. labeled \(01, C 2, \ldots, \mathrm{Cn}\), and as input you're given a collection of trace data indicating the times at which pairs of computers communicated. Thus the data is a sequence of ordered triples \((\mathrm{Cl}, C j, t k)\), such a triple indicates that \(C /\) and \(C j\) exchanged bits at time \(t k\). There are \(m\) triples total
We'll assume that the triples are presented to you in sorted order of time For purposes of simplicity, we'll assume that each pair of computers communicates at most once during the interval you're observing.
The security analysts you're working with would like to be able to answer questions of the following form: If the virus was inserted into computer Ca at time \(x\), could it possibly have infected computer \(\mathrm{Cb}\) by time \(y\) ? The mechanics of infection are simple: if an infected computer Ci communicates with an uninfected computer \(\mathrm{Cj}\) at time tk (in other words, if one of the triples \((\mathrm{Ci}, \mathrm{Cj}, t k)\) or \((\mathrm{C} j, \mathrm{Cl}, t k)\) appears in the trace data), then computer \(C j\) becomes infected as well, starting at time tk. Infection can thus spread from one machine to another across a sequence of communications, provided that no step in this sequence involves a move backward in time. Thus, for example, if \(C i\) is infected by time \(t k\), and the trace data contains triples \((C i, C j\) \(t k)\) and \((C j, C q, t r)\), where \(t k \leq t r\), then Cq will become infected via \(C\). (Note that it is okay for \(t k\) to be equal to tr ; this would mean that Cj had open connections to both \(C\) i and \(C q\) at the same time, and so a virus could move from \(\mathrm{C}\) i to \(\mathrm{Cq}\).)
For example, suppose \(n=4\), the trace data consists of the triples
\((\mathrm{C} 1, \mathrm{C} 2,4),(\mathrm{C} 2, \mathrm{C} 4,8),(\mathrm{C} 3, \mathrm{C} 4,8),(\mathrm{C} 1, \mathrm{C} 4,12)\)
and the virus was inserted into computer \(\mathrm{C} 1\) at time 2 . Then \(\mathrm{C} 3\) would be infected at time 8 by a sequence of three steps: first \(C 2\) becomes infected at time 4 , then \(C 4\) gets the virus from \(C 2\) at time 8 , and then \(\mathrm{C} 3\) gets the virus from \(\mathrm{C} 4\) at time 8 . On the other hand, if the trace data were
\((C 2, C 3,8),(C 1, C 4,12),(C 1, C 2,14)\)
and again the virus was inserted into computer \(\mathrm{C} 1\) at time 2 , then \(\mathrm{C} 3\) would not become infected during the period of observation although \(C 2\) becomes infected at time 14 , we see that C3 only communicates with \(C 2\) before \(C 2\) was infected There is no sequence of communications moving forward in time by which the virus could get from \(\mathrm{C}1\) to \(\mathrm{C} 3\) in this second example.
Design an algorithm that answers questions of this type given a collection of trace data, the aigorithm should decide whether a virus introduced at computer Ca at time x could have aeter comouter Cb by time \(y\). The algorithm should run in time \(O(m+n)\)
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Which of the following is true of Software as a Service? Select one: a. It requires...
Which of the following is true of Software as a Service?
Select one:
a. It requires an organization to maintain and develop the software.
b. It requires the installation of specialized interfaces at the client end.
c. It involves fixed monthly and yearly costs for the services.
d. It is not scalable in response to large increases in demand.
e. It allows clients to access services on an as-needed basis.
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Variations in the resistivity of blood can give valuable clues to changes in the blood's viscosity and other properties.
Variations in the resistivity of blood can give valuable clues to changes in the blood's viscosity and other properties. The resistivity is measured by applying a small potential difference and measuring the current. Suppose a medical device attaches electrodes into a 1.5-mm-diameter vein at two points 5.0 apart.
What is the blood resistivity if a 8.9 V potential difference causes a 240 mu A current through the blood in the vein (in omega*m)?
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A firm uses the pure chase strategy of aggregate planning. It produced 1000 units in the...
- add 100 units to inventory in the next period
- add 200 units to inventory in the next period
- hire workers to match the 100-unit difference
- lay off workers to match the 200-unit difference
- implement a lower price point to increase demand
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3. Which of the following is most associated with managerial accounting? a. must follow GAAP...
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3. Which of the following is most associated with managerial accounting?
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4. Which of the following is most associated with financial accounting?
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5. Which of the following statements is false?
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6. In most business organizations, the chief management accountant is called the
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The business analyst for Video Sales, Inc. wants to forecast yearly demand for DVD decoders based...
The business analyst for Video Sales, Inc. wants to forecast yearly demand for DVD decoders based on the following historical data:
| Year | Demand |
|---|---|
| 5 years ago | 900 |
| 4 years ago | 700 |
| 3 years ago | 600 |
| 2 years ago | 500 |
| Last year | 300 |
What is the forecast for this year using a three-year simple moving average?
What is the forecast for last year using simple exponential smoothing with smoothing constant alpha = 0.4, if the forecast for two years ago was 750?
What is the forecast for this year using simple exponential smoothing with smoothing constant alpha = 0.4, if the forecast for two years ago was 750?
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Christopher's Cranks uses a machine that can produce 100 cranks per hour. The firm operates 12...
Christopher's Cranks uses a machine that can produce 100 cranks per hour. The firm operates 12 hours per day, five days per week. Due to regularly scheduled preventive maintenance, the firm expects the machine to be running during approximately 95% of the available time. Based on experience with other products, the firm expects to achieve an efficiency level for the cranks of 85%. What is the expected weekly output of cranks for this company?
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24. Four employees at a fast-food restaurant each perform one of the four activities in serving...
24. Four employees at a fast-food restaurant each perform one of the four activities in serving a customer: greet customer, take order, process order, and deliver order. The processing time for each activity is given as follows:
|
Activity |
Processing time per customer |
|
Greet customer |
2 seconds |
|
Take order |
30 seconds |
|
Process order |
60 seconds |
|
Deliver order |
5 seconds |
Assume demand is unlimited. If each employee is paid $7.50 per hour,
What is the cost of direct labor associated with serving one customer (show calculations)?
What is the labor content associated with serving one customer (show calculations)?
What is the average labor utilization (show calculations)?
What is the total idle time (show calculations)?
25. Given the following data at the drive-through of a bank,
|
Customer |
Arrival Time |
Service Time (minutes) |
|
1 |
8:06 |
5 |
|
2 |
8:10 |
10 |
|
3 |
8:15 |
7 |
|
4 |
8:36 |
2 |
What is the processing time of the second customer?
What is the average processing time from 8:06 to 8:36?
What is the average interarrival time from 8:06 to 8:36?
Is there, on average, enough capacity to serve all customers (show calculations)?
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The Carbondale Hospital is considering the purchase of ambulance. The TheXarbondale Hospital is considering the purchase...
The Carbondale Hospital is considering the purchase of ambulance. The TheXarbondale Hospital is considering the purchase of ambulance. The decision will rest partly on the anticipated mileage" be driven next year. The miles driven during the past 5
years are as follows:
|
Year |
Mileage |
|
1 |
3000 |
|
2 |
4000 |
|
3 |
3400 |
|
4 |
3800 |
|
5 |
3700 |
a) Forecast the mileage for next year using a 2-year moving average.
b) Find the MAD based on the 2-year moving average forecast in part (a), (Hint: You will have only 3 years of matched data.)
c) Use a weighted 2-year moving average with weights of .4 and .6 to forecast next year's mileage. (The weight of .6 is for the most recent year.) What MAD results from using this approach to forecasting? (Hint: You will have only 3 years of matched data.)
d) Compute the forecast for year 6 using exponential smoothing, an initial forecast for year 1 of 3,000 miles, and a = .5.
*****PLEASE SHOW WORK
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