In other words, Company X surveys customers and finds that 50 percent of the respondents say its customer service is “very good.” The confidence level is cited as 95 percent plus or minus 3 percent. This information means that if the survey were conducted 100 times, the percentage who say service is “very good” will range between 47 and 53 percent most (95 percent) of the time.
no subject
Вы неправильно понимаете. Погрешность указывается в percentage points, не в процентах.
Вы, кстати, ваши комментарии в этой ветке можете теперь сами себе приводить, как вы приводите ошибку дзиги о ветвях власти.
https://www.isixsigma.com/tools-templates/sampling-data/margin-error-and-confidence-levels-made-simple/
In other words, Company X surveys customers and finds that 50 percent of the respondents say its customer service is “very good.” The confidence level is cited as 95 percent plus or minus 3 percent. This information means that if the survey were conducted 100 times, the percentage who say service is “very good” will range between 47 and 53 percent most (95 percent) of the time.