In some of the real-life situations, a researcher has to explore two or more treatments at the same time. This type of experimental design is referred to as:

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  1. contingency table design
  2. completely randomised design
  3. randomised block design
  4. factorial design

Answer (Detailed Solution Below)

Option 4 : factorial design
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Explanation

Contingency table design A contingency table provides a way of portraying data that can facilitate calculating probabilities. The table helps in determining conditional probabilities quite easily. The table displays sample values in relation to two different variables that may be dependent or contingent on one another.

Completely randomised design completely randomized design (CRD) is one where the treatments are assigned completely at random so that each experimental unit has the same chance of receiving any one treatment

randomized block design = he randomized complete block design (RCBD) is a standard design for agricultural experiments in which similar experimental units are grouped into blocks or replicates. It is used to control variation in an experiment by, for example, accounting for spatial effects in field or greenhouse

 factorial design = In statistics, a full factorial experiment is an experiment whose design consists of two or more factors, each with discrete possible values or "levels", and whose experimental units take on all possible combinations of these levels across all such factors

∴ Factorial design is the correct answer

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