A researcher studied more than​ 12,000 people over a​ 32-year period to examine if​ people's chances of becoming obese are related to whether they have friends and family who become obese. They reported that a​ person's chance of becoming obese increased by 50​% ​(90% confidence interval​ [CI], 77 to 128​) if he or she had a friend who became obese in a given interval. Explain what the 90​% confidence interval reported in this study means to a person who understands hypothesis testing with the mean of a sample of more than​ one, but who has never heard of confidence intervals.