State True or False 1)4 items in parallel, each having a reliability of 0.85 hav

Question

State True or False 1)4 items in parallel, each having a reliability of 0.85 have an overall system reliability of 0.999. True ______ False______ 2)nP chart is used when the number of defects per unit is fixed at n True ______ False______ 3)A process in control may still produce unacceptable output. True ______ False______ 4)Affinity diagram is used to identify the root causes of a problem. True ______ False _______ 5)A standard Six Sigma Process actually has a 4.5 Sigma performance True _____ False________ 6)A Control Chart is a Trend Chart (or Run Chart) that has control limits True _____ False________

Explanation / Answer

When 4 items each with reliability 0.89 are connected in parallel, the reliability of the combined system

= 1 - ( 1 – 0.89)^4

= 1 – 0.00014

= 0.99986 ( 0.999 rounded to 3 decimal places )

4 ITEMS IN PARALLEL EACH HAVING A RELIABILITY OF 0.85 HAVE AN OVERALL RELIABILITY OF 0.999 : TRUE

C hart is used when it will deal with number of defects per unit. P chart is used when one deals with proportion of defective items in samples.

P CHART IS USED WHEN NUMBER OF DEFECTS PER UNIT IS FIXED AT n : FALSE

Standard six sigma process actually has a 3 sigma performance on each side of mean i.e. the range will be mean – 3 .Sigma and mean + 3xSigma

STANDARD SIX SIGMA PROCESS ACTUALLY HAS A 4.5 SIGMA PERFORMANCE : FALSE

An Affinity Diagram is a tool that gathers large amounts of language data (ideas, opinions, issues) and organizes them into groupings based on their natural relationships (Viewgraph 1). TheAffinity process is often used to group ideas generated by Brainstorming.

Root cause of a problem is normally addressed by fish-bone structure

AFFINITY DIAGRAM IS USED TO IDENTIFY ROOT CAUSES OF A PROBLEM : FALSE

When a process is in control, all the output parameters are supposed to be within the range defined by Upper Control Limit ( UCL ) and Lower Control Limit ( LCL) . Since all output parameters will be within this range, all the output will be acceptable

A PROCESS IN CONTROL MAY STILL PRODUCE UNACCEPTABLE OUTPUT : FALSE

A run chart is a line graph of data plotted over time. By collecting and charting data over time, one can find trends or patterns in the process. Because they do not use control limits, run charts cannot tell if a process is stable. However, they can show how the process is running. Thus run chart is not a control chart

CONTROL CHART IS A TREND CHART ( RUN CHART) THAT HAS CONTROL LIMITS : FALSE

4 ITEMS IN PARALLEL EACH HAVING A RELIABILITY OF 0.85 HAVE AN OVERALL RELIABILITY OF 0.999 : TRUE

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