65 Two sources of variation in the length of hex bolts exist. Production variation and measurement error. The QC manager knows that the standard deviation from these sources is 0.24" and 0.43" , respectively. What is the total standard deviation.A. .10 in

题目

65 Two sources of variation in the length of hex bolts exist. Production variation and measurement error. The QC manager knows that the standard deviation from these sources is 0.24" and 0.43" , respectively. What is the total standard deviation.

A. .10 inch.

B. .19 inch.

C. .34 inch.

D. .49 inch.

E. .67 inch.

相似考题

1.Sources for data on activity durations and resource requirements can be gathered from which of the following:A.Past project records (historical data)B.Commercial techniques (standard practices, rules of thumb)C.Past project team members knowledge (experience, oldtimers)D.All of the aboveE.A and C only

2.A process characteristic has a true mean of 150 and a true standard deviation of 20. A sample of 25 items is taken from this process. The standard error of the estimate is:A . 0.2B . 0.8C . 4D . 5E . 7.5

3.Two sources of variation in the length of hex bolts exist. Production variation and measurement error. The QC manager knows that the standard deviation from these sources is 0.24" and 0.43" , respectively. What is the total standard deviation.A . .10 inch.B . .19 inch.C . .34 inch.D . .49 inch.E . .67 inch.

4.The specification for a particular part is 10" + or - 0.015". The standard associated process produces parts with a means of 10" and standard deviation of 0.002'. The process capability index is:A . 0.002B . 1C . 2.5D . 7.5E . None of the above

参考答案和解析
正确答案：D
更多“65 Two sources of variation in the length of hex bolts exist. Production variation and measurement error. The QC manager knows that the standard deviation from these sources is 0.24" and 0.43" , respectively. What is the total standard deviation.A. .10 in”相关问题

  • 第1题：

    For a given characteristic in a construction process, the standard deviation associated with production variation is 0.8", and the standard deviation associated with measurement variation is 0.6". The total standard deviation for this characteristic is:

    A . 1.4"

    B . 1.2".

    C . 1.0"

    D . 0.8"

    E . 0.2"


    正确答案：C

  • 第2题：

    143 For a given characteristic in a construction process, the standard deviation associated with production variation is 0.8", and the standard deviation associated with measurement variation is 0.6". The total standard deviation for this characteristic is:

    A. 1.4"

    B. 1.2".

    C. 1.0"

    D. 0.8"

    E. 0.2"


    正确答案：C

  • 第3题：

    147 A process characteristic has a true mean of 150 and a true standard deviation of 20. A sample of 25 items is taken from this process. The standard error of the estimate is:

    A. 0.2

    B. 0.8

    C. 4

    D. 5

    E. 7.5


    正确答案：C

  • 第4题：

    151 Sources for data on activity durations and resource requirements can be gathered from which of the following:

    A. Past project records (historical data)

    B. Commercial techniques (standard practices, rules of thumb)

    C. Past project team members knowledge (experience, oldtimers)

    D. All of the above

    E. A and C only


    正确答案：D

  • 第5题：

    11岁儿童的身高与体重的两组数据的变异程度大小可用

    A.mean

    B.vanance

    C.percentile

    D.standard deviation

    E.coefficient of variation


    参考答案：E

  • 第6题：

    Glove Co makes high quality, hand-made gloves which it sells for an average of $180 per pair. The standard cost of labour for each pair is $42 and the standard labour time for each pair is three hours. In the last quarter, Glove Co had budgeted production of 12,000 pairs, although actual production was 12,600 pairs in order to meet demand.

    37,000 hours were used to complete the work and there was no idle time. The total labour cost for the quarter was $531,930.

    At the beginning of the last quarter, the design of the gloves was changed slightly. The new design required workers to sew the company’s logo on to the back of every glove made and the estimated time to do this was 15 minutes for each pair. However, no-one told the accountant responsible for updating standard costs that the standard time per pair of gloves needed to be changed. Similarly, although all workers were given a 2% pay rise at the beginning of the last quarter, the accountant was not told about this either. Consequently, the standard was not updated to reflect these changes.

    When overtime is required, workers are paid 25% more than their usual hourly rate.

    Required:

    (a) Calculate the total labour rate and total labour efficiency variances for the last quarter. (2 marks)

    (b) Analyse the above total variances into component parts for planning and operational variances in as much detail as the information allows. (6 marks)

    (c) Assess the performance of the production manager for the last quarter. (7 marks)


    正确答案：
    (a)BasicvariancesLabourratevarianceStandardcostoflabourperhour=$42/3=$14perhour.Labourratevariance=(actualhourspaidxactualrate)–(actualhourspaidxstdrate)Actualhourspaidxactualrate=$531,930.Actualhourspaidxstdrate=37,000x$14=$518,000.Thereforeratevariance=$531,930–$518,000=$13,930ALabourefficiencyvarianceLabourefficiencyvariance=(actualproductioninstdhours–actualhoursworked)xstdrate[(12,600x3)–37,000]x$14=$11,200F(b)PlanningandoperationalvariancesLabourrateplanningvariance(Revisedrate–stdrate)xactualhourspaid=[$14·00–($14·00x1·02)]x37,000=$10,360A.LabourrateoperationalvarianceRevisedratexactualhourspaid=$14·28x37,000=$528,360.Actualcost=$531,930.Variance=$3,570A.Labourefficiencyplanningvariance(Standardhoursforactualproduction–revisedhoursforactualproduction)xstdrateRevisedhoursforeachpairofgloves=3·25hours.[37,800–(12,600x3·25)]x$14=$44,100A.Labourefficiencyoperationalvariance(Revisedhoursforactualproduction–actualhoursforactualproduction)xstdrate(40,950–37,000)x$14=$55,300F.(c)AnalysisofperformanceAtafirstglance,performancelooksmixedbecausethetotallabourratevarianceisadverseandthetotallabourefficiencyvarianceisfavourable.However,theoperationalandplanningvariancesprovidealotmoredetailonhowthesevarianceshaveoccurred.Theproductionmanagershouldonlybeheldaccountableforvarianceswhichhecancontrol.Thismeansthatheshouldonlybeheldaccountablefortheoperationalvariances.Whentheseoperationalvariancesarelookedatitcanbeseenthatthelabourrateoperationalvarianceis$3,570A.Thismeansthattheproductionmanagerdidhavetopayforsomeovertimeinordertomeetdemandbutthemajorityofthetotallabourratevarianceisdrivenbythefailuretoupdatethestandardforthepayrisethatwasappliedatthestartofthelastquarter.Theovertimeratewouldalsohavebeenimpactedbythatpayincrease.Then,whenthelabourefficiencyoperationalvarianceislookedat,itisactually$55,300F.Thisshowsthattheproductionmanagerhasmanagedhisdepartmentwellwithworkerscompletingproductionmorequicklythanwouldhavebeenexpectedwhenthenewdesignchangeistakenintoaccount.Thetotaloperatingvariancesaretherefore$51,730Fandsooverallperformanceisgood.Theadverseplanningvariancesof$10,360and$44,100donotreflectontheperformanceoftheproductionmanagerandcanthereforebeignoredhere.

  • 第7题：

    Your vessel is proceeding down a channel，and you see a pair of range lights that are in line dead ahead．The chart indicates that the direction of this pair of lights is 229°T，and variation is 6°W．If the heading of your vessel at the time of the sighting is 232°per standard magnetic compass，what is the correct deviation ________．

    A.3°E

    B.9°E

    C.3°W

    D.9°W


    正确答案：A

  • 第8题：

    A.mean
    B.variance
    C.percentile
    D.standard deviation
    E.coefficient of variation

    11岁儿童的身高与体重的两组数据的变异程度大小可用

    答案：E
    解析：

  • 第9题：

    A.mean
    B.variance
    C.percentile
    D.standard deviation
    E.coefficient of variation

    表示正态分布资料中的集中趋势最好采用

    答案：A
    解析：

  • 第10题：

    11岁儿童的身高与体重的两组数据的变异程度大小可用（）

    • A、mean
    • B、variance
    • C、percentile
    • D、standard deviation
    • E、coefficient of variation

    正确答案:E

  • 第11题：

    求偏态分布资料的正常值范围时，应计算（）

    • A、mean
    • B、variance
    • C、percentile
    • D、standard deviation
    • E、coefficient of variation

    正确答案:C

  • 第12题：

    多选题
    Which two of these multicast deployments are most susceptible to attacks from unknown sources?（）
    A

    ASM

    B

    BiDirPIM

    C

    PIM-SMRP

    D

    RP-Switchover

    E

    SourceSpecificMulticast


    正确答案： A,D
    解析： 暂无解析

  • 第13题：

    Assignable cause or special variation is:

    A . is indicated when a point falls outside the control limits.

    B . is indicated when a point falls outside the specification limits.

    C . is indicated when a run of seven or more points fall above the center line of a standard control chart.

    D . is indicated when a run of seven or more points fall below the center line of a standard control chart.

    E . A, C, and D.


    正确答案：E

  • 第14题：

    183 Two sources of variation in the length of hex bolts exist. Production variation and measurement error. The QC manager knows that the standard deviation from these sources is 0.24" and 0.43" , respectively. What is the total standard deviation.

    A. .10 inch.

    B. .19 inch.

    C. .34 inch.

    D. .49 inch.

    E. .67 inch


    正确答案：D

  • 第15题：

    200 The specification for a particular part is 10" + or - 0.015". The standard associated process produces parts with a means of 10" and standard deviation of 0.002'. The process capability index is: A. 0.002

    B. 1.0

    C. 2.5

    D. 7.5

    E. None of the above


    正确答案：C

  • 第16题：

    ● Sources for data on activity durations and resource requirements can be gathered from which of the following:

    A Past project records (historical data)

    B Commercial techniques (standard practices, rules of thumb)

    C Past project team members knowledge (experience, oldtimers)

    D All of the above

    E A and C only


    正确答案：D

  • 第17题：

    Rural环境下，Shadowing Standard Deviation通常选择()dB

    A6

    B7

    C8

    D10


    答案：A

  • 第18题：

    Which two of these multicast deployments are most susceptible to attacks from unknown sources?()

    A.ASM

    B.BiDirPIM

    C.PIM-SMRP

    D.RP-Switchover

    E.SourceSpecificMulticast


    参考答案：A, B

  • 第19题：

    Compass error is equal to the ______.

    A.deviation minus variation

    B.variation plus compass course

    C.combined variation and deviation

    D.difference between true and magnetic heading


    正确答案：C
    罗经差等于磁差和自差的结合。

  • 第20题：

    A.mean
    B.variance
    C.percentile
    D.standard deviation
    E.coefficient of variation

    表示正态分布的资料中数据的离散程度最常用的指标为

    答案：D
    解析：

  • 第21题：

    A.mean
    B.variance
    C.percentile
    D.standard deviation
    E.coefficient of variation

    求偏态分布资料的正常值范围时，应计算

    答案：C
    解析：

  • 第22题：

    standard deviation


    正确答案: 标准差，常用来描述数据离散趋势的统计指标，其能反映均数代表性的好坏，以及变量值与均数的平均离散程度。

  • 第23题：

    问答题
    Kara attends a university where students study for an average (arithmetic mean) of 13.4 hours per week. How many hours per week does Kara study?　　(1) The standard deviation of study time at Kara’s school is 2.8.　　(2) Kara’s study time is one standard deviation away from the mean.

    正确答案： E
    解析：
    （1）条件告诉了Kara学校学生学习时间的总标准差，无法计算Kara的学习时间数值；（2）条件指出Kara的学习时间距离平均数有两个标准差区间，不能确定其是高于还是低于平均值，故本题应选E项。

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