You Toss a Thumbtack 100 Times and Observe That It

question 25

Multiple Choice

You toss a thumbtack 100 times and observe that it lands point down 65 times. The proportion of times it landed point down is then 0.65. This proportion represents:

• A)the sample proportion of tosses that landed point down in your 100 tosses.
• B)the correlation between the number of tosses and the number of times it landed point down.
• C)the variance of the number of point-down tosses.
• D)the probability that the thumbtack lands point down.

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Definitions:

Resistance Start Induction-run Motor

A type of single-phase induction motor that uses an external resistor to increase starting torque, which is removed once the motor reaches a certain speed.

Start Winding

The winding of a split-phase motor that is connected out of phase with the run winding to produce a rotating magnetic field.

Centrifugal Switch

A switch sensitive to the speed of rotation, generally used to disconnect the start windings of a split-phase motor.

Disconnect Switch

A device used to completely de-energize a circuit for service or maintenance; it ensures the circuit is safe by physically disconnecting it from the power source.