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Can low-fat food labels lead to obesity? What are the effects of low-fat food labels on food consumption? Do people eat more of a snack food when the food is labeled as low-fat? The answer may depend both on whether the snack food is labeled low-fat and whether the label includes serving-size information. An experiment investigated this question using university staff, graduate students, and undergraduate students at a large university as subjects. Subjects were asked to evaluate a pilot episode for an upcoming TV show in a theater on campus and were given a cold 24-ounce bottle of water and a bag of granola from a respected campus restaurant called The Spice Box. They were told to enjoy as much or as little of the granola as they wanted. Depending on the condition randomly assigned to the subjects, the granola was labeled as either "Regular Rocky Mountain Granola" or "Low-Fat Rocky Mountain Granola." Below this, the label indicated "Contains 1 Serving," or "Contains 2 Servings," or it provided no serving-size information.21 Twenty subjects are assigned to each treatment, and their granola bags were weighed at the end of the session to determine how much granola was eaten.
(a) What are the factors and the treatments? How many subjects does the experiment require?
(b) Outline a completely randomized design for this experiment. (You need not actually do the randomization.)
A +2.7 µC charge is 32 cm to the right of a -5.3 µC charge. At the midpoint between the two charges, determine the potential and the electric field
Determine the magnitude of the friction force. 5.80 g lead bullet traveling at 460 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is tra..
A gas expands, changing its volume by +2.12×10-4 m3while at a constant pressure of 4.17×105 Pa. What is the work done by the gas on the surroundings
Two air track carts move along an air track one behind the other. Cart A has a mass of 0.450 kg and moves toward the right with a speed of .850 m/s and behind cart A is cart B. It has a mass of 0.300 kg and moves toward the right with a speed of 1.23..
a straight wire lies along the y-axis initially carrying a current of 10 a in the positive y-direction. the current
A 6-g bullet is fired into a 1.2-kg pendulum of length 83 cm. The pendulum swings by 12 degrees. What was the initial speed of the bullet? Please explain!!
a voltmeter is used to read the potential difference accross the poles of a battery.the battery is rated at 20 v. the
A typical lightbulb in your house is rated 200 W, which means that the bulb dissipates 200 W when connected to a DC voltage of 110 V. (a) What is the current through the lightbulb? (b) If the voltage is reduced to 55 V, what is the dissipated powe..
At a tea party, a coffeepot and a teapot are placed upon the serving table. The coffeepot is a shiny silver-plated pot with emissivity of 0.30; the teapot is ceramic and has an emissivity of 0.55. what is the rate of radiative heat loss from the tw..
A 2500 kg truck traveling north at 45 km/h turns east and accelerates to 56 km/h. What is the change in the truck's kinetic energy
two 8ohm resistors are connected in parallel, as are two 4 ohm resistors. these two combinations are then connected in series in a circuit with a 12 v battery, estimate the voltage across each resistor
A projectile is fired with an inital speed ofvi=20m/s at an angle θ=30o with the horizontal. Find the horizontal component of the projectiles's velocity at the instant jus before it hits the ground. Find the vertical component of the projectiles's ve..
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