A biochemist has developed the new drug which he claims is more effective in treatment of skin disorder than the existing drug. Using existing drug only 30% of people contracting this skin disorder recover completely. To test his claim, he administers this new drug to sample of 300 people who have contracted this skin disorder. The biochemist finds out that 140 patients in his sample show the complete recovery. Use alpha=5%.
Can the biochemist conclude that this new drug is more effective than the existing drug in treatment of this skin disorder?