Example of performing a basic hypothesis test - Minitab
You can follow six basic steps to correctly set up and perform a hypothesis test. For example, the manager of a pipe manufacturing facility wants to determine whether the average diameter of …
What is acceptance sampling? - Minitab
For example, you receive shipments of 2500 plastic pipe segments each week and you need to verify that the wall thickness measurements meet specifications. You either cannot or do not …
Interpret the key results for Multi-Vari Chart - Minitab
An interaction between machine and temperature may exist if, for instance, the pipe diameters vary across the temperature settings differently on one machine than the other. The multi-vari …
Example of an individual value plot of multiple Y variables
A quality engineer at a company that makes plastic pipes is concerned about the consistency of the pipe diameters. The engineer measures 10 pipes a week for three weeks from each of two …
Create a simple dotplot of multiple Ys - Minitab
Minitab creates a separate panel on the graph for each variable. This worksheet contains the diameters of pipes produced each week for three weeks. Week 1, Week 2, and Week 3 are …
Pipe diameter data - Data Set Library - Minitab
Because this data contains three columns of the same type of measurement data (pipe diameters), you can use it to demonstrate graphs of Multiple Y’s, such as Bar Chart of A …
Example of comparing variables acceptance sampling plans
A manufacturing engineer has implemented a variables sampling plan to verify the wall thickness of incoming 2-inch pipe. The lower specification for the pipe wall thickness is 0.09 inches.
Example of creating a variables acceptance sampling plan
For each lot of 2500 pipe segments, the engineer should randomly select and measure the thickness of 104 pipes. If Z.LSL is greater than the critical distance, in this case k = 3.55750, …
Example of Stack Blocks of Columns - Minitab
A quality engineer records pipe diameters in separate columns for each week, along with the machine that produced them. The engineer wants to combine all diameters into a single …
Select the analysis options for 1 Variance - Minitab
For example, an analyst uses this one-sided test to determine whether the standard deviation of pipe diameters is greater than 2 mm. This one-sided test has greater power to determine …