EXAMPLE 9.1

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Who uses Instagram? In Example 8.11 (page 507), we compared the proportions of young women and men who use Instagram. The following table summarizes the data used in this comparison:

Population	n	X	= X/n
1 (women)	537	328	0.6108
2 (men)	532	234	0.4398
Total	1069	562	0.5257

These data suggest that the percent of women who use Instagram is 17.1% larger than the percent for men, with a 95% margin of error of 5.9%.