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 various vendors to use in the study. the 30 pieces of sod are laid out in three different areas. the researcher places three slips of paper in a bowl labeled formula 1, formula 2, and formula 3 and randomly picks a piece of paper to apply that formula to the sod in the first area. then the researcher picks again and applies that formula to the second area. finally, the last formula is used on the last area. which component is missing from the researchers process? the researcher should not have laid out the pieces of sod in different areas. the researcher did not randomly assign the pieces of sod to the treatment groups. the researcher did not randomly pick the vendors when purchasing the pieces of sod. the researcher did not use randomization when selecting the pieces of sod from the vendors.

a researcher is comparing three new formulas for grass killer. to conduct the experiment, the researcher purchases 30 pieces of sod from various vendors to use in the study. the 30 pieces of sod are laid out in three different areas. the researcher places three slips of paper in a bowl labeled formula 1, formula 2, and formula 3 and randomly picks a piece of paper to apply that formula to the sod in the first area. then the researcher picks again and applies that formula to the second area. finally, the last formula is used on the last area. which component is missing from the researchers process? the researcher should not have laid out the pieces of sod in different areas. the researcher did not randomly assign the pieces of sod to the treatment groups. the researcher did not randomly pick the vendors when purchasing the pieces of sod. the researcher did not use randomization when selecting the pieces of sod from the vendors.

Answer

Brief Explanations:

In a proper experimental design for comparing treatments like grass - killer formulas, random assignment of experimental units (in this case, pieces of sod) to treatment groups is crucial. The researcher laid out the sod in three areas and applied formulas in a non - random way to the areas rather than randomly assigning pieces of sod to the formula groups. Randomly picking vendors or laying out sod in different areas is not the main issue here. Random assignment of experimental units to treatments ensures that the groups are comparable and reduces bias.

Answer:

The researcher did not randomly assign the pieces of sod to the treatment groups.