4. A new drug to treat the common cold was used with a randomly selected group of 100 volunteers. Each was given the drug and their health was monitored to see if they caught a cold. A randomly selected control group of 100 volunteers was treated with a dummy pill. The results are shown in the table below.
| \cline { 2 - 3 }
\multicolumn{1}{c|}{} | Cold | No cold |
| Drug | 34 | 66 |
| Dummy pill | 45 | 55 |
Using a \(5 \%\) significance level, test whether or not the chance of catching a cold is affected by taking the new drug. State your hypotheses clearly.