a researcher is comparing three new formulas for grass killer. to conduct the experiment, the researcher…

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. which component is missing from the researchers process? the researcher did not randomly pick the vendor. the researcher did not randomly pick the 30 pieces of sod. the researcher did not assign a treatment to each group of sod. the researcher did not label the pieces of sod before randomly selecting them.

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. which component is missing from the researchers process? the researcher did not randomly pick the vendor. the researcher did not randomly pick the 30 pieces of sod. the researcher did not assign a treatment to each group of sod. the researcher did not label the pieces of sod before randomly selecting them.

Answer

Answer:

The researcher did not randomly pick the 30 pieces of sod.

Explanation:

Step1: Identify key - random selection

In a proper experiment, samples should be randomly selected.

Step2: Analyze the process

The researcher only randomly assigned sod to groups but did not randomly pick the sod initially.

Step3: Evaluate options

The vendor selection is not crucial for randomness of samples. Assigning treatments and labeling are not the main random - selection issues here. So the lack of random selection of sod pieces is the problem.