A scuba instructor wants to know the opinions of scuba divers about online scuba diving tests. She obtains a list of 900 scuba divers who have recently completed an online scuba diving course and e-mails a questionnaire to a randomly selected group of 175 of these divers. Only 54 of the questionnaires are returned. Identify the population and the sample in this study. The population is 175 and the sample is 54. The population is 900 and the sample is 175. The population is 900 and the sample is 54. The population is 54 and the sample is 900. The population is 175 and the sample is 900.