Does the appearance of the interviewer influence how people respond to a survey question? Ken (white, with blond hair) and Hassan (darker, with Middle Eastern features) conducted an experiment to address this question. They took turns (in a random order) walking up to people on the main street of a small town, identifying themselves as students from a local high school, and asking them, “Do you support President Obama’s decision to launch airstrikes in Iraq?” Of the 50 people Hassan spoke to, 11 said “Yes,” while 21 of the 44 people Ken spoke to said “Yes.” Construct and interpret a 90% confidence interval for the difference in the proportion of people like these who would say they support President Obama’s decision when asked by Hassan versus when asked by Ken.