In a recent survey of US adults, 35 people were asked the question: “Do you own a smart phone?”. Of those surveyed, 29 responded that they own a smart phone. Use the “plus-four” method to find...

In a recent survey of US adults, 35 people were asked the question:   “Do you own a smart phone?”.   Of those surveyed, 29 responded that they own a smart phone.

Use the “plus-four” method to find a 90% confidence interval for the true proportion of US adults who own a smart phone. Use the z-score table below: