SCENARIO 19-4 A Factory Supervisor Is Concerned That the Time It Takes

question 43

Multiple Choice

SCENARIO 19-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below.
She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
-Referring to Scenario 19-4,suppose the supervisor constructs an R chart to see if the variability in collection times is in-control.This R chart is characterized by which of the following?

• A)Decreasing trend
• B)Increasing trend
• C)In-control
• D)Individual outliers

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Definitions:

Level Of Significance

The predetermined threshold of probability at which a statistical result is considered significant.

Causality

The relationship between causes and effects, suggesting that one event (the cause) directly affects another (the effect).

Scatterplot

A type of graph used in statistics to display values for two variables for a set of data.

Linear

Refers to a relationship or function that can be graphically represented in a straight line, indicating a proportional relationship between variables.