One population proportion test: which of the following situations involves testing a claim about a single population proportion? group of answer choices
a. a recent report estimated that 25% of all college students in the united states have a sexually transmitted disease (std). the director of the campus health center believes that the proportion of students with stds is higher at their campus.
b. according to the american heart association guidelines, the daily maximum amount of sugar a teenager should have is 4 teaspoons. the parents of a local high school have expressed concerns that the average daily sugar intake of their students is higher than these guidelines and have been pressuring school officials to limit unhealthy snack and beverage choices offered in the cafeteria and student store.
c. duke university researchers discovered that not only do women need more sleep than men but also that women tend to suffer more than men, both mentally and physically, if they are sleep deprived. a statistics class wanted to investigate the claims of this study and collected data to determine if women at their college sleep more, on average, than men.
d. the national center for health statistics issued a report that stated that women in every age group in the united states were more likely than men to have serious mental health problems. a group of researchers want to design a study to further examine these results.