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In order to determine whether or not a particular medication was effective in curing the common cold, one group of patients was given the medication, while another group received sugar pills. The results of the study are shown below.

	Patients Cured	Patients Not Cured
Received medication	70	10
Received sugar pills	20	50

We are interested in determining whether or not the medication was effective in curing the common cold.

The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:

A. 3.84

B. 7.81

C. 5.99

D. 9.34

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Category:- Statistics and Probability
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