9) A researcher at a University wishes to estimate the textbook costs of first-year students. To do so, she recorded the textbook cost of 250 first-year students and found that their average textbook cost was $300 per semester. 1- The population of interest is A) The 250 students that were recorded. B) All University students C) All first-year students D) All college students. 2- The sample in the study is A) All first-year students. B) All the university students. C) The 250 students that were recorded. D) All college students. 3- The variable of interest is A) The year in school of the university students. B) The age of all university students. C) The cost of incidental expenses of all university students. D) The textbook cost of first-year students. 10) In a study to determine the average number of cows per farm in KSA, a sample of 50 farms was 'randomly selected from AL-Kharj farms. The number, of cows in each farm in the sample was recorded. The total number of cows in all the farms in the sample was 225 cows. Answer the following-three questions: 1. The population is a) The number of cows in AL-Kharj. b) All the cows in AL-Kharj. c) All farms in AL-Kharj. d) All farms in KSA. e) The number of cows per farm in AL-Kharj. 2. The sample in the problem above is a) 225 cows. b) 225 cows in the 50 selected farms. c) The number of cows per farm d) The 50 farms selected at random. e) The average number of cows per farm in AL-Kharj. 3. The purpose of the survey is to measure a) The number of cows in KSA. b) The number of cows in AL-Kharj. c) The average number of cows in AL-Kharj. d) The average number of cows in KSA. e) None of the above