Question

"a. How many study subjects were cases? b. How many study subjects were controls? c. What was the ratio of controls to cases?"

Answer 1

The description is provided following.

Explanation:

The given question is incomplete. The complete question will be:

Brain tumors No Brain tumors

Cell Phones 63 185

No Cell Phones 96 292

The further explanation is given below.

a...

Subjects with these symptoms/diseases are recognized as "cases." Consequently, the majority of the instances would be as follows:

⇒
`63+96`

⇒
`159`

b...

Subjects who might not have the disorder or infection are classified as "controls." Therefore, the amount of controls is as follows:

⇒
`185+292`

⇒
`477`

c...

The proportion of control and monitoring of instances:

⇒
`(478)/(159)`

⇒
`3.006`