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Group Exercise on Research Design Replication Strategies

Explore and analyze the impact of various treatments on different subjects. Compare significance through replication, randomization, and control methods. Learn to select samples, identify variables, and test validity.

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Group Exercise on Research Design Replication Strategies

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  1. Research Design

  2. Replication • Repetition of the basic experiment • See if units respond the same way to the same treatment • Significance of the results can be tested • Number of replicates depends on • Degree of precision required • Degree of homogeneity of the sample • Number of treatments in the study

  3. Randomization Negative control • Chance assignment of experimental units to the treatment or vice-versa • Assures valid and unbiased estimates of means and differences between treatments • Test for significance is valid 1% 5% 10% Positive control

  4. Local control • Balancing grouping and blocking of experimental units in the experimental design • Blocking – assignment of units to a block to ensure that the block is homogeneous

  5. 3 5 6 1 2 4 7 13 14 8 10 11 12 9 15

  6. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

  7. Group Exercise • Identify dependent, independent, and extraneous variables. • Enumerate the treatments given. • How many replicates were used? • How many samples were used in the project? How were these chosen from the population? • Which type of research design (CRD or RCBD) was chosen or was most appropriate for the project. Why? Bonus: What was the test of significance used?

  8. Group Exercise Groups 1 and 2 – Comparative analysis of the effects of VCO and olive oil on the cholesterol levels in rabbits Groups 3 and 4 – Utilization of blood of stray dogs as a component of blood agar plates Groups 5 and 6 – Formulation of an all-organic nutrient solution for lettuce Groups 7 and 8 – Mango seed kernels as an alternative source of starch in flour Groups 9 and 10 – Lecithin organogels as a topical aid of green tea extracts for the treatment of inflammatory skin disease

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