An experiment is being planned to study urban land use practices aimed at revivi

Question

An experiment is being planned to study urban land use practices aimed at reviving and sustaining native bird populations. Vegetation types A and B are to be compared, and eight test sites arc available. After planting, volunteer skilled birdwatchers will collect data on the abundance of bird species making each of the two habitat types their home, The east side of the dry borders a river, while the south side borders an industrial park. (a) Suppose the decision is made to block using the scheme below (one block is white, one gray). How would you use randomization, and what is the purpose of the randomization? (b) Comment on the strength and weakness of the above scheme as compared to the following blocking scheme (one block is white, one gray).

Explanation / Answer

A)

In this we are using block size ,After block size has been determined, all possible balanced combinations of assignment within the block (i.e., equal number for all groups within the block) must be calculated. Blocks are then randomly chosen to determine the patients’ assignment into the groups.

purpose:

Randomization reduces bias as much as possible. Randomization is designed to "control" (reduce or eliminate if possible) bias by all means.

The fundamental goal of randomization is to certain that each treatment is equally likely to be assigned to any given experimental unit.

B)

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