Based on a Random Sample of 13 Tire Changes,the Mean

question 37

Multiple Choice

Based on a random sample of 13 tire changes,the mean time to change a tire on a Boeing 777 has a mean of 59.5 minutes with a standard deviation of 8.4 minutes.For 10 tire changes on a Boeing 787 the mean time was 64.3 minutes with a standard deviation of 12.4 minutes.To test for equal variances in a two-tailed test at  = .10,the critical values are:

• A) 3.73 and 0.228
• B) 2.51 and 3.67
• C) 3.07 and 0.398
• D) 3.07 and 0.357

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Definitions:

Electrical Synapses

Specialized junctions through which cells of the nervous system signal to each other via direct flow of electric current.

Myelin Sheath

A fatty layer that surrounds the axons of some nerve cells, providing insulation and speeding up electrical impulses.

Lipids

A group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins, and others, serving as energy storage, structural components of cell membranes, and important signaling molecules.

EPSPs

Excitatory postsynaptic potentials, which are temporary increases in postsynaptic membrane potential caused by the flow of positively charged ions into the postsynaptic cell.