In a recent study on the effects of sleep and test results, volunteers took a math test. The volunteers who had 8 hours of sleep were three times more likely to answer questions correctly on the math test than were sleep-deprived volunteers. Complete parts a through d. (a) Identify the sample used in the study. Choose the correct answer below. O A. The sample is the sleep-deprived participants in the study. O B. The sample is the amount of sleep the volunteers got in the study. O C. The sample is the test results of the volunteers in the study. O D. The sample is the math questions in the study. (b) What is the sample's population? Choose the correct answer below. O A. The population is the collection of all the individuals who might ever complete the math test. B. The population is the collection of all the math questions from the math test O C. The population is the collection of the test results of all individuals who might ever complete the math test. (c) Which part of the study represents the descriptive branch of statistics? Choose the correct answer below. O A. The statement "In a recent study" is an example of descriptive statistics. O B. The statement "8 hours of sleep" is an example of descriptive statistics. O C. The statement "three times more likely to answer questions correctly" is an example of descriptive statistics. (d) Make an inference based on the results of the study. Choose the correct answer below. O A. Math problems are difficult. O B. It is a good idea to get 8 hours of sleep a night. O C. Individuals who are not sleep deprived will be more likely to answer math questions correctly than individuals who are sleep deprived