Three Brands of Running Shoes Are Each Tested by 10

question 18

True/False

Three brands of running shoes are each tested by 10 different runners. The amount of wear on the sole of the shoes is then measured. The objective is to determine if there is any difference among the three brands of shoes based on how long the soles last. The degrees of freedom for testing whether there is any blocking effect D1 = 9 and D2 = 18.

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Definitions:

Nucleotides

The building blocks of DNA and RNA, consisting of a nitrogenous base, a sugar (ribose in RNA, deoxyribose in DNA), and one to three phosphate groups.

Pyrimidines

Nitrogenous bases, each composed of a single ring of carbon and nitrogen atoms (e.g., thymine, cytosine, and uracil); components of nucleic acids. Compare with purines.

Phosphate Groups

Phosphate groups are chemical groups consisting of a phosphorus atom bonded to four oxygen atoms (PO4), important in energy transfer within cells.

Ribose Groups

Components of RNA molecules consisting of five-carbon sugars connected to the nucleobases and phosphate groups.