Statistics is defined as the science of collecting, analyzing, and drawing conclusions from data. Data is usually collected through sampling surveys, observational studies, or experiments.
Experiment is the scientifically planned method to draw a valid conclusion about a particular problem. The variation due to environmental factor or uncontrolled factor is called as experimental error.
Experimental Unit is the item under study upon which something is changed. This could be raw materials, human subjects, or just a point in time. It is the small plot of the block to which the treatment can be applied.
Design: Whenever an experiment is done by using certain scientific (statistical ) procedure, it is called as design. It can also be defined as the various types of plot arrangements which are used to test a set of treatments to draw a valid conclusion about a particular problem.
Treatment: The objects under comparison are called treatments.
The choice of treatment, the method of assigning treatments to experimental units and the arrangement of experimental units in various pattern to suit the requirements of a particular problem is called as design of experiment. It is also the process of planning and study to meet the specific objectives. Experimental design was first introduced by prof. R.A. Fischer in 1920.
Why experimental design?
increase precision of experiment
reduce experimental error
in screening of various treatments
in partitioning of variation into different components
used in proper interpretation of scientific results and drawing valid conclusion
in reducing soil heterogeneity
in assessment of variance and covariance
shows the direction of better results
includes the plan of analysis and reporting the results
Answers & Comments
Answer:
1. Some definitions before we start :
Statistics is defined as the science of collecting, analyzing, and drawing conclusions from data. Data is usually collected through sampling surveys, observational studies, or experiments.
Experiment is the scientifically planned method to draw a valid conclusion about a particular problem. The variation due to environmental factor or uncontrolled factor is called as experimental error.
Experimental Unit is the item under study upon which something is changed. This could be raw materials, human subjects, or just a point in time. It is the small plot of the block to which the treatment can be applied.
Design: Whenever an experiment is done by using certain scientific (statistical ) procedure, it is called as design. It can also be defined as the various types of plot arrangements which are used to test a set of treatments to draw a valid conclusion about a particular problem.
Treatment: The objects under comparison are called treatments.
The choice of treatment, the method of assigning treatments to experimental units and the arrangement of experimental units in various pattern to suit the requirements of a particular problem is called as design of experiment. It is also the process of planning and study to meet the specific objectives. Experimental design was first introduced by prof. R.A. Fischer in 1920.
Why experimental design?
increase precision of experiment
reduce experimental error
in screening of various treatments
in partitioning of variation into different components
used in proper interpretation of scientific results and drawing valid conclusion
in reducing soil heterogeneity
in assessment of variance and covariance
shows the direction of better results
includes the plan of analysis and reporting the results