Статистика! a sample of 1300 people is to be used to estimate the proportion of left-handed people. suppose the true proportion of left-handed people in the population is 12% (which is unknown to the organizers of the observational study). a) what is the probability that as a result of the survey, the estimate will differ by more than 2% from the true value 12%? use the normal approximation to solve this problem. b )what should be the minimal sample size to guarantee that the obtained estimate doesn't differ by more than 2% from the true value 12% with probability at least 99%?
