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

The description is provided following.

Step-by-step 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:

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⇒    

b...

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

⇒  

⇒  

c...

The proportion of control and monitoring of instances:

⇒  

⇒  

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step-by-step explanation:

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step-by-step explanation: