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Problem: A marketing class designs two videos advertising an expensive Mercedes sports car. They test the videos by asking fellow students to view both (in random order) and say which makes them more likely to buy the car. Mercedes should be reluctant to agree that the video favored in this study will sell more cars because
(a) the study used a matched pairs design instead of a completely randomized design.
(b) results from students may not generalize to the older and richer customers who might buy a Mercedes.
(c) this is an observational study, not an experiment.
when a 45.0-v emf device is placed across two resistors in series a current of 15.0 a is flowing in each of the
A transformer with a turns ratio (secondary/primary) of 1:14 is used to step down the voltage from a 120-V wall socket to be used in a battery recharging unit.What is the voltage supplied to the recharger?
Let's say you measure an average acceleration to be 0.4045 ms-2. What is the height (in centimeters) of the riser block
An electronic flash attachment for a camera produces a flash by using the energy stored in a 860-mu F capacitor. Between flashes, the capacitor recharges through a resistor whose resistance is chosen so the capacitor recharges with a time constant..
Two hockey players strike a puck of mass 0.169 kg with their sticks simultaneously, exerting forces of 1.25 103 N, directed west, and 9.80 102 N, Find the instantaneous acceleration of the puck
An RLC series circuit has R=1.35 kOhm, L=225 mH, and C=2.50 uF (micro farads) and is connected across a 60 Hz power supply. find the reactances of the capacitor and inductor
A particle moves so that its position (in meters) as a function of time in (in seconds) is r = I + 3.0 t^2 J+t K. Write expressions for its velocity and its acceleration as functions of time. Evaluate for t = 6.1 s. i-component of velocity?
A simple pendulum consists of a ball connected to one end of athin brass wire. evaluate the change in the period of the heated pendulum
a uniform electric field has magnitude 260 nc and is directed to the right. a particle with charge 4.3 nc moves along
Two boats start together and race across a 64-km-wide lake and back. Boat A goes across at 64 km/h and returns at 64 km/h. Boat B goes across at 32 km/h, and its crew, realizing how far behind it is getting, returns at 96 km/h. Turnaround times ar..
A 42-g ball consists of a plastic spherical shell and a water-filled core. the shell has an outside diameter equal to 56.2 mm, What is the density of the plastic
A person desires to reach a point that is 5.40 km from her present location and in a direction that is 41° north of east. What is the minimum distance she could travel to reach her destination
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