Quality Management Quiz 7

The histogram is used for plotting:

• discrete variables
• continuous variables
• many variables
• random variables

The Pareto chart is used for:

• identifying the causes of an effect
• prioritizing based on frequency
• defect analysis
• identifying the effect of causes

Correlation shows:

• if there is an association between 2 variables
• the model of a relationship between 2 variables
• the influence of a variable on another
• the causality between 2 variables

The Pearson coefficient can take:

• only negative values
• values between -1 and 1
• just positive values
• values between 0 and 1

A Pearson coefficient of -0.85 indicates a correlation that is:

• weak and positive
• strong and positive
• weak and negative
• strong and negative

Linear regression shows

• if there is an association between 2 variables
• the model of a relationship between 2 variables
• the influence of a variable on another
• the causality between 2 variables

An R^2 coefficient of 0.85 indicates

• a positive correlation
• a good fit for a regression model
• a bad fit for a regression model
• R^2 doesn't take positive values

If we take samples of 15 parts per hour for 20 hours from a process, we use what control chart?

• x_bar / s
• x_bar / R
• I / MR
• np /p

In analyzing a control chart, if we identify a trend, what action should we take first:

• reduce the temperature
• increase the productivity
• stop the process
• analyze the results

The Ishikawa chart is used for:

• identifying effects
• identifying potential causes of an effect
• prioritizing based on frequency
• planning a process