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Read the scenario below to determine which one of the three factors that influence reliability (instrument, group, test administration) is of most concern to the scenario.  A proctor for an end-of-course examination decides to allow students to eat during the exam since the exam is near the lunch hour.  The proctor instructs the students to be as quiet as possible during the exam and to remember they only have two hours to finish the exam.  Several students complain there is too much noise.  Some students do not finish the exam.  

Define  random assignment. What role does random assignment play in internal validity?

A sample of blood is placed in a centrifuge of radius 11.0 cm. The mass of a red blood cell is 3.0 ✕ 10−16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 ✕ 10−11 N. At how many revolutions per second should the centrifuge be operated?

A 4.00-kg mass sitting flat on a table is pushed to the right by a force of 12.0 N.  However, the force of static friction keeps it in place.  If the coefficient of static friction is 0.500, what is the force of static friction pointing left?

James writes, “Religion that God our Father accepts as ________ and faultless is this: to look after orphans and widows in their distress and to keep oneself from being polluted by the world.”  

Paul’s name apears in the greeting of __________ New Testament “letters,” nearly half the “books” in the New Testament.

The author of Hebrews writes, “…he (Jesus) became as much superior to the _________ as the name he has inherited is superior to theirs.”

The author of Hebrews uses the _________Scripture to help explain what the new Christian faith is about.

The spring of the pressure gauge shown in the figure has a force constant of 900 N/m, and the piston has a radius of 1.5 cm. As the gauge is lowered into water, what change in depth causes the piston to move in by 0.88 cm? The density of water is 1,000 kg/m3. Give your answer in meters.  

Titus received his letter from Paul while he was still on the island of ________.