KHAN ACADEMY AP STATISTICS EXAM 2024 QUESTIONS AND ANSWERS ALREADY GRADED A

KHAN ACADEMY AP STATISTICS EXAM 2024 QUESTIONS AND ANSWERS ALREADY GRADED A Researchers were studying how playing a dancing video game impacts heart rate. They measured the heart rates (in beats per minute) of 151515 subjects before they danced a song and again after they finished dancing the song. They want to use these results to estimate the average difference between before and after heart rates. a paired t interval for mean difference The owners of a large shopping complex wondered if there was a relationship between how customers traveled to the complex and whether or not they made a purchase. They observed a random sample of customers and categorized each of them based on transportation method and whether or not they made a purchase. x^2 test of independence According to the distributor of a kind of trading card, 66%66%66, percent of the cards are common, 25%25%25, percent are uncommon, and 9%9%9, percent are rare. Avery wondered if the rarity levels of the cards she and her friends owned followed this distribution, so she took a random sample of cards and recorded their rarity levels. x^2 goodness of fit test Lylah created an app, and she recently updated the app. She randomly samples a group of users to estimate what percentage of all users are using the updated version. z interval for proportion Raul lives in Richmond and his brother Alejandro lives in Aberdeen. They both complained about the high prices of avocados where they live, so they wondered if, on average, avocados were more expensive in one of their cities. Each of them took a random sample of shops in their city and got the price of avocado from each shop. A two-sample ttt-test for the difference of means A college professor wonders if there is a relationship between how long students spend on their midterm exam and their resulting score. The professor picks a random sample of students to observe and notes each of their times (in minutes) and their scores (from 000 to ). slope test People applying for a driver's license In California usually need to take a multiple choice test as a part of the application process. An administrator of these tests wants to estimate the average number of questions that people get correct on the test. They take a random sample of scores from testers. t interval for a mean Apgar score is a number between 000 and 101010 that gives a measure of the physical condition of a newborn infant. Researchers collected the Apgar scores of 202020 sets of identical twins to test if the first-born twin's score was, on average, different than the second-born twin's score. A paired ttt-test for the mean difference