A group of dental researchers are testing the effects of acidic drinks on dental crowns. They have five containers of crowns labeled V, W, X, Y, and Z. They will randomly select one of the containers to be the control for the experiment by drawing one of five well-mixed slips of paper with the same labels from a hat. Which of the following is the probability model for the control container?
Answer
A
Table with 5 columns and 2 rows.Row 1: Column 1, 'V'; Column 2, 'W'; Column 3, 'X'; Column 4, 'Y'; Column 5, 'Z' Row 2: Column 1, '0 point 2 0'; Column 2, '0 point 1 0'; Column 3, '0 point 3 0'; Column 4, '0 point 2 0'; Column 5, '0 point 2 0'
B
Table with 5 columns and 2 rows.Row 1: Column 1, 'V'; Column 2, 'W'; Column 3, 'X'; Column 4, 'Y'; Column 5, 'Z' Row 2: Column 1, '0 point 2 5'; Column 2, '0 point 2 5'; Column 3, '0 point 2 5'; Column 4, '0 point 2 5'; Column 5, '0 point 2 5'
C
Table with 5 columns and 2 rows.Row 1: Column 1, 'V'; Column 2, 'W'; Column 3, 'X'; Column 4, 'Y'; Column 5, 'Z' Row 2: Column 1, '0 point 2 0'; Column 2, '0 point 2 0'; Column 3, '0 point 2 0'; Column 4, '0 point 2 0'; Column 5, '0 point 2 0'
There are five slips, one for each container, and drawing a well-mixed slip gives each container an equal chance of being selected. Each probability is 1 ÷ 5 = 0.2, or 0.20. Choice B assigns 0.25 to each container, so those probabilities would add to more than 1; choice C correctly shows 0.20 for each.
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