4. A manufacturer of a traditional medicine claims that the medicine is 90% effective in relieving backache for a period of eight hours. In a sample of 200 people who have backache, the medicine provided relief for 160 people. Test the manufacturer's claim at 1% signicance level. 5. Umar Pharmacy Limited, a pharmacy company claimed that not more than 1% that used its drug experience side effects. To prove its claim, 2500 patients were subscripted with the drugs and only 74 experienced the sides effects. Can the claim by the Umar Pharmacy Limited be accepted at u = 0.05