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. to create the three treatment groups, the researcher numbers the pieces of sod 1 - 30 and places the numbers in a hat. the researcher randomly selects 10 numbers, making sure to mix the numbers between each selection, and then repeats that process one more time to select the pieces of sod in the experiment. which component is missing from the researchers process? the researcher did not use randomization when assigning the groups. the researcher should not have purchased sod from different vendors. the researcher did not assign the chosen pieces of sod to treatment groups. the researcher should have randomly selected 10 numbers a total of three times.

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. to create the three treatment groups, the researcher numbers the pieces of sod 1 - 30 and places the numbers in a hat. the researcher randomly selects 10 numbers, making sure to mix the numbers between each selection, and then repeats that process one more time to select the pieces of sod in the experiment. which component is missing from the researchers process? the researcher did not use randomization when assigning the groups. the researcher should not have purchased sod from different vendors. the researcher did not assign the chosen pieces of sod to treatment groups. the researcher should have randomly selected 10 numbers a total of three times.

Answer

Answer:

The researcher should have randomly selected 10 numbers a total of three times.

Explanation:

Step1: Analyze the experiment setup

The researcher has 30 pieces of sod for 3 treatment - groups.

Step2: Determine correct random - selection

To create 3 equal treatment - groups of 10 pieces of sod each, 10 numbers should be randomly selected three times. The current process only randomly selects 10 numbers twice, which is incorrect.