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An Agricultural Researcher Wishes to Compare the Yield of Four

Question 69
Essay

An agricultural researcher wishes to compare the yield of four different varieties of wheat.64 plots of land are available for an experiment.On each plot of land one of the varieties of wheat will be grown.At the end of the experiment the yield for the different varieties will be compared.32 of the plots are at one site (site A)and the other 32 are at another site (site B).The soil at site A differs significantly from the soil at site B.The researcher wishes to design an experiment.In this example,why might a randomized block design,with blocking by soil type,be preferable to a completely randomized design?

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Q 70
In a clinical trial,each participant will receive a placebo,a low dosage of a drug,or a high dosage of the drug.The participants consist of 90 men and 90 women.The 90 men are randomly divided into three groups of 30.Each group of men is randomly assigned to a different treatment (placebo,low dose,or high dose).Likewise,the 90 women are randomly divided into three groups of 30.Each group of women is randomly assigned to a different treatment (placebo,low dose,or high dose).Is this a completely randomized design or a randomized block design? Explain your answer.
Q 71
An agricultural researcher wishes to compare the yield of four different varieties of wheat.64 plots of land are available for an experiment.On each plot of land one of the varieties of wheat will be grown.At the end of the experiment the yield for the different varieties will be compared.32 of the plots are at one site (site A)and the other 32 are at another site (site B).The soil at site A differs significantly from the soil at site B.If the researcher wishes to design an experiment using randomized block design,how could the wheat varieties be assigned to the different plots?
Q 72
A manufacturer of tennis rackets has designed a new racket and would like to compare it to their previous design.They design an experiment as follows.They will obtain 100 volunteer tennis players.Volunteers will be randomly assigned to one of two groups.Group 1 will use the company's previous racket first and the new racket second.Group 2 will use the company's new racket first and the previous racket second.Each player will serve 100 times with each racket.The percentage of good serves with the two rackets will then be compared.The experiment is double blind.If the group of volunteers consists of 60 professional tennis players and 40 beginners,explain why blocking by tennis level would be important.
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