(b) you come across another research report which tells you that a company interviewed a sample of 683 people. the purpose of the study had been to look at the fraction of people who continued to buy books from bricks-and-mortar stores. the percentage of such people had been taken to be 20% and it was mentioned that the company had worked with a tolerance of error of 3%. given this information can you figure out what was the confidence level which had likely been used for this research?