Question

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. The researchers grew one type of bacteria in twenty-four identical covered petri dishes. Then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. They left the remaining six petri dishes closed as a control group. When the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. The researchers concluded that not using any hand sanitizer would lead to the least bacterial growth.

Which statement best explains why the researchers’ conclusion was not justified

Answer 1

The correct answer for the question that is being presented above is this one: "Since the sample is too small fr a bacteria that is used in the investigation, then it is not valid."
Here are other invalid conclusions:
The conclusion is not valid since the same amount of bacteria was used in each dish. 
The conclusion is valid since too small a sample of bacteria was used in this investigation. 
The conclusion is valid since the amounts of bacteria were measured at the end of the investigation. 
The conclusion might not be valid since the investigation was carried out only once.

Answer 2

Answer:

C on edge

Explanation: