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To test a new medicine, each of 300 volu...

To test a new medicine, each of 300 volunteers was assigned a distinct number from 1 to 300. Next, a calculator was used to simulate drawing 150 balls from among 300 congruent balls. The balls were numbered the same way as the volunteers so that 150 volunteers to receive the new medication would be chosen without bais. THe other volunteers received a placebo. Weeks later, the 2 group were compared. Which of the following phrases best bescribes the company's testing?

A

Randomized census

B

Randomized experiments

C

Nonrandomized experiments

D

Randomized sample survey

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The correct Answer is:
B
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ENGLISH SAT-PRACTICE TEST 1-EXERCISE
  1. A line contains the points A,B,C and D. Point B is between points A an...

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  2. If x and y are positive intergers such that the greastest common facto...

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  3. To test a new medicine, each of 300 volunteers was assigned a distinct...

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  4. One cautions sign flashes evergy 4 second, and another caution sign fl...

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  5. For all nonzero values of a and b, the value of which of the following...

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  6. Graphed in the same standard (x,y) coodinate plane are a circle and a ...

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  7. 40% of 250 is equal to 60% of what number?

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  8. Which of the following inequalities is equivalent to -2x - 6y > 2y - 4...

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  9. For an angle with measure alpha in a right triangle, sin alpha = 40/41...

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  10. The perimeter of rectangle ABCD is 96 cm. The ratio of the side length...

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  11. For /\ABC shown below, base bar(AC) has a length of 16 inches and alt...

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  12. In the figure below, ABCD is a rectangle, EFGH is a square, and bar(CD...

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  13. In the figure below, ABCD is a rectangle, EFGH is a square, and bar(CD...

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  14. In the figure below, ABCD is a rectangle, EFGH is a square, and bar(CD...

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  15. In the figure below, ABCD is a rectangle, EFGH is a square, and bar(CD...

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  16. What is the length in coordinate units, of the altitude from C to bar(...

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  17. At a local post office, on average , 3 customers are in line when the ...

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  18. What is the amplitude of the function f(x) = 1/2 cos(3x + pi)?

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  19. License plates on cars in a certain state consist of 3 letters taken f...

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  20. For 20 quiz scores in a typing class, the table below gives the freque...

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