A researcher is studying the effect of three different row spacings on the yield

Question

A researcher is studying the effect of three different row spacings on the yields of four varieties of cotton. He randomly assigns each row spacing-variety combination to six 50" x 50" plots. Within each plot he randomly selects 12 plants and weighs the cotton yield of the individual plants. a. Is this an observational study or an experimental study? b. What type of experimental design is this? C. What is (are) the treatment factor(s)? d. What are the experimental units? e. What are the measurement units?

Explanation / Answer

a. Is this an observational study or an experimental study?

Answer: Experimental study

b. What type of experimental design is this?

Answer: Randomized Complete block design

c)  What is (are) the treatment factor(s)

Answer: Three different row spacing are treatments

d) What are the experimental units?

Answer: The plots are the experimental units

e) What are the measurement units?

Answer: The yields of 4 varities of cotton

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