A sociologist studying teen behavior took independent random samples of students from two high schools, f and g. Of the 80 students selected from high school f, 36 indicated they had seen a certain movie. Of the 72 students selected from high school g, 18 indicated they had seen the movie. Which of the following is the test statistic for the appropriate test to investigate whether there is a difference in population proportions (high school f minus high school g) ?.

This graph represents four ecosystems. each ecosystem has a different number of species, adding to its biodiversity. different colors represent different species. which statements correctly summarize the data depicted by the graph? 1. ecosystem d has more biodiversity than ecosystem c. 2. ecosystem b has more biodiversity than all the other ecosystems. 3. ecosystem a has more biodiversity than ecosystem b but less biodiversity than ecosystem c. 4. ecosystem b has more biodiversity than ecosystems c and d but less biodiversity than ecosystem a. 5. ecosystem a has more biodiversity than ecosystem c but less biodiversity than ecosystem b.