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i. Tests of hypotheses for nominal or ordinal levels of measurement are called nonparametric or distribution-free tests. ii. There is not one, but a family of chi-square distributions. There is a chi-square distribution for 1 degree of freedom, another for 2 degrees of freedom, another for 3 degrees of freedom, and so on.
iii. The shape of the chi-square distribution depends on the size of the sample.
Muscle Contraction
The tightening of muscle fibers initiated by electrical impulses, leading to shortening of the muscle and movement or force generation.
Sarcoplasmic Reticulum
Smooth endoplasmic reticulum of skeletal muscle cells; surrounds the myofibrils and stores calcium ions.
Calcium Ions
Electrically charged calcium atoms (Ca2+) that play a crucial role in various physiological processes, including muscle contraction, neurotransmitter release, and bone formation.
Muscle Impulses
Electrical signals that travel along the nerve fibers to stimulate muscle contraction.
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