You are exploring starting a company that rents higher-end bicycles. You suspect that your service would be of more interest to condo-dwellers than to people who live in houses, because they have less room to store bikes. To investigate, you survey samples from both groups, asking whether they own a high-end bike. 11 out of the 81 condo residents said that they own a bike; 17 out of 75 house residents said that they own a bike.

Use 'condo' as population 1 and 'house' as population 2.

Determine the point estimate for the difference between population proportions.