Basic Statistical Concepts

- Normal distribution

This histogram indicates a(n) __________. - Incorrectly plotted histogram - Precision machine - Inadequate sample - Normal distribution

- Special

Variations come in two types. One is common. What is the other variation type? - Natural - Uncommon - Factoring - Special

- Number of inspections

What is reduced because of the ability to predict nonconformities in production? - Number of parts production - Number of inspections - Number of data points - Number of SPC reports

- Range

What is the difference between the largest value and the smallest value in the data set? - Range - Mode - Factor - Span

- Frequency

What must be counted once the boundaries are determined? - Intervals - Placement - Frequency - Histogram

- Histogram

What shows how a specific feature varies in data? - Chart - Histogram - R chart - Variable Chart

- Bimodal

What type of histogram shape is used to show two distinct data sets? - Skewed - Bimodal - Chopped - Unstable

- Plotted data values that show good central tendency

A bell-shaped curve can be described by which of the following statements? - Plotted data values that show good central tendency - Plotted data values that illustrate unstable processes - Plotted data values with alternating center points - None of the above

- Unstable

A special cause variation will not create a bell curve in the data. What is said of the process if the variation is special? - Stable - Unstable - Unpredictable - Unprecedented

- Statistical Process Control

SPC stands for __________. - Standard practices and competencies - Statistical Process Control - Staffing protocols and cost - Standard part cost

- Stability

The histogram can determine important aspects of a process. What is one of the characteristics of the process that can be determined? - Structure - Experiences - Expenses - Stability