Question

*Medal for the best answer* A scientist is trying to determine whether the use of cell phone contributes to brain cancer. For his study, he compares the medical records of subjects who have been diagnosed with brain cancer to the records of healthy subjects. What is the most significant weakness in this type of study?

Answer 1

The test groups must be unusually large to generate significant data.

The relationship between cell phone use and cancer is difficult to determine.

This type of study is expensive, and the data are difficult to analyze.

This type of study must rely on medical records, which are inaccurate.

Answer 2

When you compare the medical record of a braincancer patient to the medical record of a healthy patient, how do you know if the patient with brain cancer used his phone more often than the healthy patient? It can be exactly the opposite and still the patient who used his phone less is diagnosed with brain cancer. So it is very hard to determine the relationship between the cancer and cell phone use.

Answer 3

Thanks :)

Answer 4

You're welcome \(\huge ツ\)

Answer 5

@thomaster so what was the answer on this one im a bit confused

Answer 6

I clearly told the answer in my explanation...

Answer 7

Im guessing A or D

Answer 8

When you compare the medical record of a braincancer patient to the medical record of a healthy patient, how do you know if the patient with brain cancer used his phone more often than the healthy patient? It can be exactly the opposite and still the patient who used his phone less is diagnosed with brain cancer. \(\sf\color{red}{So\ it\ is\ very\ hard\ to\ determine\ the\ relationship\ between\ the\ cancer\ and\ cell\ phone\ use.}\)

Answer 9

lol oh my bad its B sorry

Answer 10

blond moment

Answer 11

Haha no problem :P

Answer 12

ok stay on so i can tag you when i need help please !

Answer 13

@thomaster