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Q:
Moving average (MA) methods work best when:
a. a long planning horizon is involved.
b. a cyclical pattern is observed in a time series.
c. demand is relatively stable and consistent.
d. there is a major trend in a time series.
Q:
The advantage of using the interquartile range as a measure of variation is that it utilizes all the data in its computation.
Q:
If a population standard deviation is computed to be 345, it will almost always be the case that a standard deviation computed from a random sample from that population will be larger than 345.
Q:
A tracking signal provides a method for monitoring a forecast by quantifying _____.
a. bias
b. throughput
c. probability
d. validity
Q:
For a given set of data, if the data are treated as a population, the calculated standard deviation will be less than it would be had the data been treated as a sample.
Q:
In the context of data patterns in a time series, a(n) _____ variation is a one-time variation that is explainable.
a. cyclical
b. random
c. irregular
d. seasonal
Q:
_____ is a forecasting technique that uses a weighted average of past time-series values to forecast the value of the time series in the next period.
a. A moving average forecast
b. Single exponential smoothing
c. A grassroots forecast
d. Regression analysis
Q:
The interquartile range contains the middle 50 percent of a data set.
Q:
_____ is a common approach to gather data for judgmental forecasts.
a. A moving average model
b. Regression analysis
c. A survey questionnaire
d. Single exponential smoothing
Q:
A store manager tracks the number of customer complaints each week. The following data reflect a random sample of ten weeks. 11
19
4
6
8
9
6
4
0
3 The standard deviation for these data is approximately 27.78.
Q:
The mean absolute percentage error (MAPE) for the forecasts shown in the following table is:MonthForecast DemandActual DemandApril110100May150125June160170July110130August150180a. less than or equal to 5 percent.b. more than 5 percent but less than or equal to 10 percent.c. more than 10 percent but less than or equal to 15 percent.d. more than 15 percent.
Q:
The following table shows the data for the sales of tennis rackets at a store for 4 consecutive months. Find the forecast error in month 4 using a 3-month moving average.Month1234Sales8095125110a. The forecast error in month 4 is less than or equal to 5.b. The forecast error in month 4 is more than 5 but less than or equal to 10.c. The forecast error in month 4 is more than 10 but less than or equal to 15.d. The forecast error in month 4 is more than 15.
Q:
Alex, a manager at Symbic Inc., plotted the company's total energy costs of 1 billion dollars over the past 10 years on a chart. The chart suggested that the energy costs appear to be increasing in a fairly predictable linear fashion and that the energy costs are related to time by a linear function Yt =3+5t, where Yt represents the estimate of the energy cost in year t. Given the equation, which of the following is the value of the intercept of the straight line that best fits the time series?
a. 1
b. 3
c. 5
d. 10
Q:
The interquartile range is the difference between the mean and the median.
Q:
One of the reasons that the standard deviation is preferred as a measure of variation over the variance is that the standard deviation is measured in the original units.
Q:
The mean square error (MSE) for the forecasts shown in the following table is:MonthForecast DemandActual DemandApril170180May225200June210200July260240August200230a. more than 250 but less than or equal to 300.b. more than 300 but less than or equal to 350.c. more than 350 but less than or equal to 400.d. more than 400 but less than or equal to 450.
Q:
The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership. Consider the following data as representing the population of cars sold in each of the 8 weeks that the dealership has been open. 3
5
2
7
7
7
9
0 The population standard deviation is approximately 2.87 cars.
Q:
A moving average (MA) method is most appropriate for data with major identifiable trends.a. Trueb. False
Q:
Judgmental forecasting relies upon historical data in developing forecasts.
a. True
b. False
Q:
In the context of demand planning, customers' wants and needs define the customer benefit package.
a. True
b. False
Q:
When a variance is calculated for a data set, the resulting value is the same regardless of whether the data set is treated as a population or a sample.
Q:
Call center service training is a preproduction service that requires forecasts to create value in a value chain.
a. True
b. False
Q:
The range is an ideal measure of variation since it is not sensitive to extreme values in the data.
Q:
Forecasting is a key component in customer relationship management.
a. True
b. False
Q:
A dairy farm in Wisconsin bottles milk in one gallon containers. At a recent meeting, the production manager asked top management for a new filling machine that he argued would assure that all containers had exactly one gallon of milk. Based on sound statistical principles, the top management group should conclude that the production manager could have merit to his argument.
Q:
Indicate whether the statement is true or false.In the context of causal forecasting models with multiple regression, an R-squared (R2) value of 0.70 means that 30 percent of the variation in the dependent variable is explained by the independent variable.a. Trueb. False
Q:
When surveyed, a sample of 1,250 patients at a regional hospital provided interviewers with the following summary statistics pertaining to the hospital charges:
Minimum = $278.00 Q1 = $1,245 Q2 = $3,567 Q3= $4,702.
Based on these data, the distribution is seen to be symmetric.
Q:
An assembly line with 30 activities is to be balanced. The total amount of time required for all 30 activities is 45 minutes. The line will operate for 360 minutes per day. Which of the following must be the cycle time to achieve an output rate of 200 units/day?
a. 0.66 minutes
b. 1.5 minutes
c. 1.8 minutes
d. 4.5 minutes
Q:
The first approach to designing process layouts is used when it is difficult to obtain data on costs or volumes moved between departments. The second approach focuses on the costs associated with moving materials. Identify a major difference between these two approaches.
a. The first approach relies on materials-handling costs as the primary criterion while the second approach relies on a preference table that specifies the importance of two departments being close to one another.
b. The first approach relies on materials-handling costs as the primary criterion while the second approach uses the geometric centroid of each department.
c. The first approach uses the geometric centroid of each department while the second approach relies on materials-handling costs as the primary criterion.
d. The first approach relies on a preference table that specifies the importance of two departments being close to one another while the second approach relies on materials-handling costs as the primary criterion.
Q:
Which of the following is true of fixed-position layouts?
a. The changeover requirements are low.
b. The automation potential is moderate.
c. The volume of product demand is high.
d. The equipment utilization is high.
Q:
In drawing a box and whisker plot the upper limit length of the whiskers is 1.5(Q3-Q1).
Q:
In a cellular layout, the procedure of classifying parts with similar processing requirements into families is called _____.
a. group technology
b. traits analysis
c. batch processing
d. commonality identification
Q:
A recent study involving a sample of 3,000 vehicles in California showed the following statistics related to the number of miles driven per day: Q1 = 12, Q2 = 45, and Q3 = 56. Based on these data, if a box and whisker plot is developed, the upper limit value is 122 miles.
Q:
Identify the most suitable layout for a facility that handles a wide variety of customized orders.
a. A fixed-position layout
b. A cellular layout
c. A product layout
d. A process layout
Q:
_____ is vertical expansion of job duties to give the worker more responsibility.
a. Employee empowerment
b. Job enlargement
c. Employee recognition
d. Job enrichment
Q:
Megan plans the facility layout of her new shop that would sell a variety of healthcare industry machines. She arranges the machines in a way that the machines are grouped according to their functions. Which of the following types of facility layouts has Megan used in her shop?
a. A process layout
b. A product layout
c. A cellular layout
d. A fixed-position layout
Q:
The right and left edges of the box in a box and whisker plot represent the 3rdand 1stquartiles, respectively.
Q:
One of the disadvantages of a product layout is that it has:
a. high materials handling.
b. high work-in-progress inventory.
c. low flexibility.
d. low labor utilization.
Q:
A box and whisker plot shows where the mean value falls relative to the median for a variable.
Q:
One of the differences between product layouts and process layouts is that unlike product layouts, process layouts:
a. require highly specialized equipment.
b. provide more flexibility.
c. have higher automation potential.
d. have less materials-handling costs.
Q:
The objective of assembly-line balancing is to:
a. minimize the imbalance among workstations while trying to achieve a desired output rate.
b. maximize the cost of operations while trying to reduce the cycle time.
c. maximize the cycle time while trying to minimize the cost of operations.
d. minimize the imbalance among workstations while trying to maximize the cycle time.
Q:
It is possible for a set of data to have multiple modes as well as multiple medians, but there can be only one mean.
Q:
Which of the following is an objective of ergonomics?
a. To increase the cost of doing a job while reducing fatigue
b. To reduce energy requirements while increasing accuracy
c. To increase the possibility of human errors while decreasing the cost of training
d. To reduce the flexibility in an operation while increasing speed
Q:
Recently an article in a newspaper stated that 75 percent of the households in the state had incomes of $20,200 or below. Given this input, it is certain that mean household income is less than $20,200.
Q:
A _____ is a reasonable estimate of the amount of time needed to perform a task based on an analysis of the work by an operations expert.
a. standard time
b. time study
c. standard measurement
d. work measurement
Q:
If the mean value of a variable is 200 and the median is 150, the third quartile must be at least 200.
Q:
Which of the following types of facility layouts is best suited for a heavy machine tools factory?
a. A product layout
b. A process layout
c. A cellular layout
d. A fixed-position layout
Q:
A set of data is considered to be symmetric if the 3rdquartile is three times larger than the 1stquartile.
Q:
One of the advantages of a product layout is that it:
a. can easily accommodate a change in product design.
b. has low work-in-process inventories.
c. does not usually require highly specialized equipment.
d. can easily accommodate new products.
Q:
If a set of data has 540 values, the 3rdquartile corresponds to approximately the 135thvalue when the data have been arranged in numerical order.
Q:
_____ is concerned with improving productivity and safety by designing workplaces, equipment, instruments, computers, workstations, and so on that take into account the physical capabilities of people.
a. Ergonomics
b. Employee motivation
c. Job design
d. Job enrichment
Q:
If a set of data has 1,500 values, the 30thpercentile value will correspond to the 450thvalue in the data when the data have been arranged in numerical order.
Q:
A _____ layout is an arrangement based on the sequence of operations that is performed during the manufacturing of a good or delivery of a service.
a. product
b. process
c. cellular
d. fixed-position
Q:
The second quartile for a set of data will have the same value as the 50thpercentile only when the data are symmetric.
Q:
The production of large goods such as ships is best accomplished using a _____ layout.
a. product
b. process
c. cellular
d. fixed-position
Q:
When the median of a data set is 110 and the mean is 127, the percentile associated with the mean must be higher than 50 percent.
Q:
Organizations that need the ability to provide a wide variety of services to customers with differing requirements usually use a _____ layout.
a. cellular
b. process
c. fixed-position
d. product
Q:
When analyzing annual incomes of adults in a market area, the marketing manager's report indicated that the 90thpercentile is $123,400. That means that 90 percent of the adult incomes in the market area fall at or below $123,400.
Q:
Which of the following is a limitation of a process layout?
a. It affects the entire system if any equipment in the layout fails.
b. It has higher worker skill requirements.
c. It has highly specialized equipment requirements.
d. It generally requires a low investment for the production of machines.
Q:
Which of the following is true of a cellular layout?
a. It remains stationary rather than moving work-in-process from one work center to another.
b. Its workflow is not standardized.
c. It is not designed according to the functional characteristics of equipment.
d. Its quality problems are not addressed timely.
Q:
First Pacific Bank has determined that the mean checking account balance for all its customers is currently $743.50. Based on this, it is fair to say that about half the customers have balances exceeding $743.50.
Q:
A data set in which the mean, median, and mode are all equal is said to be a skewed distribution.
Q:
_____ is the interval between successive outputs coming off the assembly line.
a. Idle time
b. Cycle time
c. Lack-of-work delay
d. Blocking delay
Q:
Suppose a study of houses that have sold recently in your community showed the following frequency distribution for the number of bedrooms: Bedrooms
Frequency 1
1 2
18 3
140 4
57 5
11 Based on this information, it is possible to determine that the distribution of bedrooms in homes sold is right-skewed.
Q:
Three work study analysts are rating an employee. Work study analyst 1 rates the employee at performance rating factor = 1.0 and an observed time of 2.8 minutes per unit. Work study analyst 2 rates the employee at PRF = 1.1 and an OT of 3.1 minutes per unit. Work study analyst 3 rates the employee at PRF = 0.8 and an OT of 3.0 minutes per unit. What should the standard time be, assuming an allowance factor of 20%?
a. 3.560 minutes per unit
b. 3.339 minutes per unit
c. 3.444 minutes per unit
d. 3.667 minutes per unit
Q:
Compared to product layouts, process layouts:
a. require a lower investment in equipment.
b. provide less flexibility.
c. have high equipment utilization.
d. have less materials-handling costs.
Q:
In the context of assembly-line balancing, _____ is the difference between total time available and the sum of the actual times for productive tasks.
a. blocking delay
b. lack-of-work delay
c. idle time
d. cycle time
Q:
_____ is a technique to group tasks among workstations so that each workstation hasin the ideal casethe same amount of work.
a. Job enlargement
b. Assembly-line balancing
c. Cellular manufacturing
d. Job enrichment
Q:
FancyTrends Inc., a handbag manufacturing company, assembles handbags in an assembly line using 10 workstations. The target output for an 8 hour workday is 120 bags. The sum of the task times is 30 minutes/bag. The cycle time is 4 minutes/bag. The assembly-line efficiency is _____.
a. 65%
b. 70%
c. 75%
d. 80%
Q:
One of the primary advantages of using the median as a measure of the center for a set of data is that the median is not affected by extreme values in the data.
Q:
In a recent study of the sales prices of houses in a Midwestern city, the mean sales price has been reported to be $167,811 while the median sales price was $155,600. From this information, you can determine that the data involved in the study are left-skewed.
Q:
Process layouts require simple planning and control systems.a. Trueb. False
Q:
According to a study conducted by Software Advice, the likelihood of consumers buying a particular product remains unaffected even when the production of that product causes reduced environmental impact.
a. True
b. False
Q:
A distribution is said to be symmetric when the sample mean and the population mean are equal.
Q:
You are given the following data: 23
34
11
40
25
47 Assuming that these data are a sample selected from a larger population, the median value for these sample data is 25.5.
Q:
Facility layout does not enhance sustainability in service-producing organizations.
a. True
b. False
Q:
You are given the following data: 9
11
14
22
31 Assuming that these data reflect the population of interest, these data can be considered symmetric.
Q:
Research has shown that bringing the outdoor environment into the workplace lowers stress.
a. True
b. False
Q:
When news articles report on household income level they usually report the median income, rather than the mean income. This would be because income is usually a right-skewed distribution.
Q:
The design of service facilities requires the clever integration of layout with the servicescape and process design to support service encounters.
a. True
b. False