Final Chapter 10 Supplement

Which of the following is not a use of labor standards?
All of the above are uses of labor standards. (labor content, cost and time estimates, crew size and work balance, wage-incentive plans)
Labor standards can help a firm determine expected production, which in turn enables
managers and workers to know what constitutes a fair day’s work.
Which of the following techniques may not provide reliable and accurate time standards?
historical experience
Timing a sample of a worker’s performance and using it to set a standard is the work measurement
technique of
time studies
For a time study, the three factors that determine how large a sample size to take are
needed accuracy, desired confidence, and absolute amount of error
A manager who is conducting a time study now needs an accuracy of ±0.1 minutes, rather than
±0.2 minutes as in the past. Because of this change in accuracy, the adequate sample size becomes
none of the above (1/4 as large, 1/2 as large, twice as large, four times as large)
In time studies, average observed time for an element is
for all observations, the sum of all times recorded divided by the number of observations
A time study is being conducted to determine the standard time for a job that is made up of several
elements. This standard time requires as input(s)
the average observed time for each element
In time studies, normal time is
average observed time multiplied by a performance rating factor
Standard time
accounts for performance rating factors and for allowances
The smaller the percentage established for allowances
the closer is normal time to standard time
In a stopwatch time study, the average time it takes a given worker to perform a task a certain
number of times, without correction for performance rating or allowances, is the
average observed time
Which of the following are true regarding allowances in time studies?
All of the above are true. (have a constant and variable component, adjusted for work conditions, include allowances for personal time, represent adjustment between normal and standard time)
In work measurement, personal time allowances are often established in the range of
4 – 7%
The actual average observed time for a given job is 10 minutes. The performance rating is 80%,
and allowances are set by contract at 10%. What is the time standard?
8.88 minutes
The data below represent time study observations for an assembly operation. Assume a 7%
allowance factor. What is the normal time for element 3?
(The data was in a table that couldn’t be transferred to quizlet. Problem 40)
1.96 min.
The accuracy of a labor standard is to be within 5%, and the confidence level is 95%. The standard
deviation of the sample is 2 and the mean is 8. What sample size should be used?
96
Which of these is the most common predetermined time standard?
MTM
A work sampling study requires an acceptable error level of 10 percent and z = 2 for 95.45 percent
confidence. The adequate sample size is _______ if the sample proportion is thought to be as large
as 50 percent, but ________ if the sample proportion is thought to be about 20 percent.
100; 64
Sample observations of a claims processor made over a 160-hour work month reveal that the
worker produced a total of 384 completed claims forms. The performance rating was 80%. The
worker was idle 20% of the time (so that idle time should be subtracted from the total time when
computing the average observed time). The allowance factor is 8%. What is the normal time per
unit?
16.0 minutes
Sample observations of a claims processor made over a 160-hour work month reveal that the
worker produced a total of 384 completed claims forms. The performance rating was 80%. The
worker was idle 20% of the time (so that idle time should be subtracted from the total time when
computing the average observed time). The allowance factor is 8%. What is the standard time per
unit?
17.4 minutes
A Time Measurement Unit, or TMU, is
0.00001 hour
Therbligs
were named by Frank Gilbreth
Therbligs are
the smallest unit of basic motion used in methods time measurement exercises
Predetermined time standards are an outgrowth of basic motions called
therbligs
Among the advantages of predetermined time standards are all of the following except
they can only be determined after work actually takes place
All of the following are advantages of predetermined time standards except
they are customized to your company
Which of the following is true regarding work sampling?
It can be used to estimate the percentage of time workers spend in unavoidable delays.
A technique for estimating the proportion of time a worker spends on various activities is
work sampling
A bank manager wants to determine the percent of time the bank’s tellers are working and idle. He
decides to use work sampling, and his initial estimate is that the tellers are idle 20% of the time.
Approximately how many observations should be taken to be 95% confident that the results will
not be more than 5% away from the true result?
246
The tally sheet data from a work sampling study provides information regarding
the percent of time spent on various tasks
An advantage of work sampling is that
the time spent observing the employee is relatively short
A disadvantage of work sampling is that
it tends to be less accurate, particularly when task times are short