What is Statistical Quality Control and its Role in Data-Driven Decision Making?

Sophia ClarkeMarch 29, 2023

Are you tired of dealing with poor quality products or services that are costing your business a fortune? Did you know that in the US alone, poor quality costs businesses a staggering $3.1 trillion annually? It’s time to take control of your business processes with Statistical Quality Control (SQC), a set of powerful statistical methods used to monitor and control product or service quality

In this blog, we will delve into the basics of Statistical Quality Control, its role in data-driven decision making, and how it can benefit any organization

In this blog, you’ll learn:

Statistical Quality Control (SQC) is a methodology used to monitor and control the quality of products or services. SQC uses statistical tools and techniques to measure and analyze the data gathered during manufacturing or service delivery to ensure that the products or services meet or exceed customer expectations.

Statistical Quality Control aims to identify and eliminate defects or variations in production processes, improving product or service quality and reducing waste. By analyzing data, SQC can help identify patterns and trends that can be used to make data-driven decisions that improve overall quality and productivity. SQC is widely used across many industries, including manufacturing, healthcare, and service industries

Example of Statistical Quality Control (SQC)

Let’s say you own a bakery that makes chocolate chip cookies. You want to ensure that your cookies are consistently delicious and meet your quality standards, so you decide to implement statistical quality control

To do this, you start by measuring the weight of each cookie that comes out of the oven. You record the weight of each cookie and plot the data on a control chart, which has a center line representing the average weight of the cookies and upper and lower control limits representing acceptable weight ranges

As you continue to make cookies, you keep plotting the weight data on the control chart. If the weight of a cookie falls outside the upper or lower control limit, you investigate to identify the cause of the deviation. For example, if a cookie is too heavy, you might check to see if you’re using too much dough or if your oven temperature is too high

By monitoring the weight of your cookies using statistical quality control, you can identify and correct any problems in your baking process. This helps ensure that your cookies are consistently delicious and meet your quality standards

What are the Different Types of Statistical Quality Control?

There are several types of Statistical Quality Control techniques, here are some examples and relatable scenarios for each of them:

Control Charts

Control charts are a graphical representation of process data over time that helps to identify any changes or variations in the data. For example, a manufacturing plant can use control charts to monitor the weight of the products being produced, and detect any deviations in the weight from the established standards

Acceptance Sampling

This technique involves taking a sample of products from a batch or lot and inspecting them to determine if they meet the quality standards. For example, a food manufacturer can randomly select a few packets of its products and inspect them for freshness, texture, and taste

Six Sigma

Statistical Process Control (SPC)

Failure Mode and Effects Analysis (FMEA)

FMEA is a systematic approach to identifying potential failures in a product or process, and taking proactive measures to prevent those failures. For example, an automobile manufacturer can use FMEA to identify potential failure modes in the engine, and take measures to prevent those failures from occurring

Statistical Quality Control vs Statistical Process Control: What Sets Them Apart?

What are the Advantages of Statistical Quality Control?

Identifies and corrects defects

SQC helps to identify and correct defects early in the process. This prevents costly rework and reduces waste, improving overall efficiency and productivity

Improves consistency

SQC ensures that products or services are produced consistently, meeting the same quality standards each time. This leads to increased customer satisfaction and brand loyalty

Reduces variability

By monitoring and controlling the process, SQC reduces the variability of the product or service, resulting in fewer defects and less waste

Improves decision-making

SQC provides data and insights that can help organizations make informed decisions about process improvements, quality control, and resource allocation

Enhances employee involvement

SQC involves employees in the quality control process, empowering them to take ownership of their work and identify opportunities for improvement

Ensures compliance

SQC helps organizations comply with regulatory requirements and standards by ensuring that their products or services meet the required quality specifications


Statistical Quality Control (SQC) is an essential tool for any business looking to make data-driven decisions and achieve success in today’s competitive market. By implementing SQC, you can monitor and control your business processes, ensuring that your products or services meet the required quality standards. This not only reduces costs associated with defects, rework, and lost productivity but also improves customer satisfaction and loyalty

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