A Nevada Bank Keeps Track of Errors from 20 Clerks

question 34

Essay

A Nevada Bank keeps track of errors from 20 clerks.Each sample has 100 records.They want to construct a P-chart to track the proportion of errors in each sample.The table below shows the number of errors per sample.(Use z=3 for control limit calculations.)

a.Determine P.
b.Determine σP.
c.Determine the 3-sigma UCL and LCL.
d.Does the process appear to be in statistical control?

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Definitions:

Balance-Scale Problem

A psychological task used to study the development of children's understanding of balance and the principles of weight and leverage.

Siegler's First Rule

A principle or guideline proposed by psychologist Robert Siegler, though without additional context, the specific rule cannot be described.

Weights

Weights refer to objects used for resistance training, designed to help increase muscle strength, endurance, and size.

Problem Solving Strategies

Techniques or methods applied to identify solutions to complex or challenging situations.