Question

checkpoint question (1/2): sleep awareness week begins in the spring with the release of the national sleep foundations annual poll of u.s. sleep habits and ends with the beginning of daylight savings time, when most people lose an hour of sleep. in the foundations random sample of 1029 u.s. adults, 48% reported that they often or always got enough sleep during the past 7 nights. identify the parameter of interest. $p = 1029$ u.s. adults $p =$ the true proportion of all u.s. adults who often or always got enough sleep during the past 7 nights $p = 48%$ of u.s. adults who often or always got enough sleep during the past 7 nights $p =$ all u.s. adults

Explanation:

A parameter is a characteristic of a population. Here, the population is all U.S. adults. The parameter of interest is the proportion of all U.S. adults who "often or always" got enough sleep during the past 7 nights. The first option ($p = 1029$ U.S. adults) is incorrect because 1029 is the sample size. The third option ($p=48\%$ of U.S. adults who "often or always" got enough sleep during the past 7 nights) is incorrect as 48% is a sample proportion (a statistic). The fourth option ($p =$ all U.S. adults) is incorrect as $p$ represents a proportion, not the entire population.

Answer:

$p=$ the true proportion of all U.S. adults who "often or always" got enough sleep during the past 7 nights