Question 8 • Academy - Algebra, Functions, and Data Analysis
A researcher is comparing three new formulas for grass killer. To conduct the experiment, the researcher purchases 30 pieces of sod from a local vendor and selects the treatment groups by placing slips of paper numbered 1–30 in a hat. To make three groups for the three formulas, the researcher randomly selects 10 numbers, making sure to mix the slips between each selection, to get the formula 1 group. Then the researcher selects 10 more numbers to get the formula 2 group. The remaining 10 numbers make up the formula 3 group.
Answer
A
The researcher did not randomly pick the vendor.
B
The researcher did not randomly pick the 30 pieces of sod.
C
The researcher did not assign a treatment to each group of sod.
D
The researcher did not label the pieces of sod before randomly selecting them.
Explanation
The slips numbered 1–30 determine which numbers go into each treatment group, but the sod pieces themselves have no corresponding labels. Without labeling each piece, the researcher cannot tell which sod should receive formula 1, formula 2, or formula 3. The pieces must be labeled before using the random selections to assign treatments.
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