Essay on Research Design

1726 Words Feb 22nd, 2012 7 Pages

A. Definition

Research design refers to the complete sequence of steps to be undertaken to ensure that the appropriate data will be obtained in a way which permits an objective analysis leading to valid inferences with respect to the stated problem. It is a step in problem solving consisting of a detailed plan to be followed in obtaining the needed data. It specifies what organisms, chemicals, glasswares, and equipment will be used in the study.

B. Significance

1. It serves as a guide for direction during the actual experimentation.
2. It allows a gain of maximum information relevant to the problem at minimum cost.
3. It makes the statistical test of significance valid because it takes into consideration
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- refers to the assignment of the experimental units to the treatment or vise versa by chance. It assures us a valid or unbiased estimate of population parameters e.g. means and differences between treatments. It assures the validity of the statistical tests of significance.

Local Control
- refers to the balancing, grouping, and blocking of experimental units that is employed to the adopted design. Blocking is the allocation of the experiment to a block in such a manner that the units within the block are relatively homogeneous. Some bases for blocking are height, age, sex, weight, fertility gradient, and pH gradient.

E. Basic Types of Design

There are basically two types of designs namely: Completely Randomized Design (CRD) and Randomized Complete Block Design (RCBD). The other designs are the variations of these two basic types.

Completely Randomized Design (CRD)

Treatments are randomly assigned to the experimental subjects without restriction. The experimental subjects are assumed to be homogeneous with respect to the factors that could affect the treatments being compared.

Randomization Procedure
Suppose there are 15 experimental subjects, three of which will receive one of five treatments A, B, C, D, or E. The three subjects receiving a particular treatment will be considered three replicates for the treatment. The following steps are

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