## What is pairwise testing technique?

Pairwise testing, also known as all-pairs testing is the method of finding defects by using a combinational method of two test cases. It relies on the observation that most defects are caused by interaction of at most two factors.

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## What is orthogonal array in software testing?

Orthogonal array testing is a black box testing technique that is a systematic, statistical way of software testing. It is used when the number of inputs to the system is relatively small, but too large to allow for exhaustive testing of every possible input to the systems.

**Why do we test pairwise?**

The advantages of pairwise testing are: Pairwise testing reduces the number of execution of test cases. Pairwise testing increases the test coverage almost up to hundred percentage. Pairwise testing increases the defect detection ratio.

### How do you choose an orthogonal array?

Three 3-level factors: A, B, C. Interactions: AxB, AxC, AxC. The total of the degree of freedom is (3×2 + 3×4) = 18. Following the rule of design of experiments (DOE), the number of experimental trials in the orthogonal must be greater than the total of the degree of freedom, therefore, L27 orthogonal is a good choice.

### What are pairwise t tests?

A paired t-test is used to compare two population means where you have two samples in which observations in one sample can be paired with observations in the other sample.

**What is orthogonal array in Taguchi method?**

Taguchi Orthogonal Array (OA) design is a type of general fractional factorial design. It is a highly fractional orthogonal design that is based on a design matrix proposed by Dr. Genichi Taguchi and allows you to consider a selected subset of combinations of multiple factors at multiple levels.

#### How does an orthogonal array work?

An orthogonal array is simple if it does not contain any repeated rows. An orthogonal array is linear if X is a finite field Fq of order q (q a prime power) and the rows of the array form a subspace of the vector space (Fq)k. Every linear orthogonal array is simple.

#### What is the benefit of orthogonal arrays when designing experiments?

Taguchi Orthogonal arrays are balanced to ensure that all levels of all factors are considered equally. For this reason, the factors can be evaluated independently of each other despite the fractionality of the design.

**What do you mean by orthogonal array?**

An orthogonal array (more specifically a fixed-element orthogonal array) of s elements, denoted by OAN(sm) is an N × m matrix whose columns have the property that in every pair of columns each of the possible ordered pairs of elements appears the same number of times.

## What are the two main categories of software testing?

Though there are different types of software testing in practice but, the two major categories are Functional and Non-functional types of testing along with manual, utomated and system programming testing types.

## What is the difference between t-test and paired t-test?

3.3 Differences between the two-sample t-test and paired t-test. As discussed above, these two tests should be used for different data structures. Two-sample t-test is used when the data of two samples are statistically independent, while the paired t-test is used when data is in the form of matched pairs.

**Why Taguchi orthogonal array is used?**

Taguchi Orthogonal arrays are balanced to ensure that all levels of all factors are considered equally. For this reason, the factors can be evaluated independently of each other despite the fractionality of the design. This article will show how to perform a Taguchi OA design using DOE++.

### What are pairwise combinations?

In computer science, all-pairs testing or pairwise testing is a combinatorial method of software testing that, for each pair of input parameters to a system (typically, a software algorithm), tests all possible discrete combinations of those parameters.

### What is pairwise tool?

Pairwise Testing Tools: Tools are available that applies the all-pairs testing technique that facilitates us to effectively automate the Test Case Design process by generating a compact set of parameter value choices as the desired Test Cases.

**What is orthogonal array in design of experiments?**

Orthogonal arrays can be viewed as plans of multifactor experiments where the columns correspond to the factors, the entries in the columns correspond to the test levels of the factors and the rows correspond to the test runs.

#### Is a systematic statistical way of testing pairwise combinations?

Orthogonal Array testing is a systematical and statistical way of testing pair-wise interactions.