LSSGB Sample Questions & Answers

An effective problem statement should be SMART (Specific, Measurable, Achievable, Relevant, Time-bound). This statement is vague. It doesn't quantify the problem (e.g., 'delivery times average 10 days against a target of 3'), specify the scope (e.g., 'for North American customers'), or indicate the time frame over which the problem has been observed. Without these measurable and specific details, the team cannot establish a baseline or measure success.

A Cpk value less than 1.0 indicates that the process is not capable of consistently meeting its specification limits. A common industry benchmark for a capable process is a Cpk of 1.33 or higher. The 'k' in Cpk specifically accounts for how centered the process average is relative to the specification limits. A low Cpk value implies either the process variation is too wide, the process average is not centered between the specification limits, or both. Therefore, a Cpk of 0.45 definitively means the process is not capable and likely off-center.

The 2-sample t-test is used to compare the means of two independent groups. Since the data is normally distributed, a parametric test like the t-test is appropriate. Because the variances are unequal, the specific version of the 2-sample t-test that does not assume equal variances (often called Welch's t-test) must be used. A Paired t-test is for dependent samples, ANOVA is for three or more groups, and the Mann-Whitney U test is a non-parametric alternative used when the data is not normally distributed.

A Fractional Factorial Design is an experiment where only a subset (a fraction) of the runs from a full factorial design are performed. In this case, a full factorial experiment with three factors at two levels each would require 2^3 = 8 runs. By conducting only 4 runs, the team is using a half-fraction design. This is done to save time and resources, at the cost of confounding some effects (usually higher-order interactions are confounded with main effects).

The inspection process generates attribute data ('Correct' or 'Incorrect'), which is discrete and categorical, not continuous. An Attribute Agreement Analysis is the specific type of Measurement System Analysis (MSA) designed for this type of data. It assesses the consistency and correctness of appraisers, evaluating how well each appraiser agrees with themselves (repeatability) and with other appraisers or a known standard (reproducibility). A variable Gage R&R is used for continuous data, and a Cpk study measures process capability, which can only be done after the measurement system is proven reliable.

The 'Sort' (Seiri) step is the first and foundational phase of 5S. Its primary purpose is to go through all items in a workspace—tools, materials, documents—and separate what is essential for the work from what is not. Unnecessary items are then removed, recycled, or relocated. This declutters the workspace, frees up space, and eliminates the waste of searching for needed items among clutter.

Value Stream Mapping (VSM) is a lean tool used to visualize the entire flow of a process, from request to delivery. Unlike a simple flowchart, a VSM specifically documents process steps, material and information flows, and key metrics like cycle time, lead time, and wait time. Its primary purpose is to identify waste, bottlenecks, and non-value-added activities, making it the perfect tool for the scenario described.

This statement is true. A pilot is a crucial step in the Improve phase used to test a solution in a controlled, limited environment. This allows the team to verify the solution's effectiveness, identify unforeseen problems, assess risks, and refine the implementation plan with minimal disruption and cost before committing to a full-scale deployment.

In a Cause and Effect (or Fishbone/Ishikawa) diagram, causes are categorized to ensure a thorough analysis. "Inadequate employee training" relates directly to the skills, knowledge, and abilities of the personnel involved in the process. Therefore, it would correctly be placed under the 'People' (or 'Manpower') branch of the diagram.