One population proportion test: which of the following situations involves testing a claim about a single population proportion? the centers for disease control estimates that 22.8% of americans (ages 18 to 24) get 6 or less hours of sleep per night. a researcher believes that the figure for college students is higher than this. the mean sat math score for florida is 514. an educational researcher is concerned that this average may be lower in rural counties. a statistics student wants to determine whether there is a difference in the average number of credit hours male and female students are taking. a growing practice among some parents is called "redshirting," redshirting means holding a child back a year from starting kindergarten even though he or she is eligible by age. many states use august 31 as the cutoff for the 5th birthday in order for a child to start kindergarten. a researcher is curious if the proportion of boys with august birthdays who are redshirted is different than the proportion of girls with august birthdays who are redshirted.