How many of the ten questions listed below involve confidence interval for a population mean? [Enter an integer number] How many hours does a full-time undergraduate UW student spend working at a job, per week, on average? Does a full-time undergraduate UW student spend an average of more than 15 hours working at a job per week? Does the percentage of full-time undergraduate UW students who were born in Washington differ from 75%? What proportion of full-time undergraduate UW students were born in Washington? What proportion of people with a driver's license in Washington have indicated a willingness to be an organ donor? Have less than two-thirds of all people with a driver's license in Washington indicated a willingness to be an organ donor? What is the price of an average transaction at Pagliacci Pizza in the HUB on campus? What proportion of transactions at Pagliacci Pizza in the HUB on campus include a soft drink? Do most transactions at Pagliacci Pizza in the HUB on campus include a soft drink? Do weekday UW staff employees take sick days disproportionately often on Mondays and Fridays