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ybuje 901 101 918 1 An American history professor at a major university was interested in knowing the history literacy of college freshmen In particular he wanted to find what proportion of college freshmen at the university knew which country controlled the original 13 colonies prior to the American Revolution The professor sent a questionnaire to all freshman students enrolled in HIST 101 and received responses from 318 students out of the 7 500 students who were sent the questionnaire One of the questions was What country controlled the original 13 colonies atnsmissit bris nofset oldene prior to the American Revolution a What is the population of interest to the b What is the sampled population Sofessor 318 Students bianco 292 A snistros 2 A study was conducted to determine if the inclusion of a foreign language requirement in high schools may have a positive effect on students performance on standardized English exams From a sample of 100 high schools 50 of which had a foreign language requirement and 50 of which did not it was found that the average score on the English proficiency exam was 25 higher for the students having a foreign language requirement What confounding variables may be present that would invalidate the conclusion that requiring a foreign language in high school increases English language proficiency 1919b bns 1926t6b gniwollot 9rt 19 bizno 3 For each of the following situations decide what sampling method you would use Provide an explanation of why you selected a particular method of sampling a The major state university in the state is attempting to lobby the state legislature for a bill that would allow the university to charge a higher tuition rate than the others16918 6 universities in the state To provide a justification the university plans to conduct a mail survey of its alumni to collect information concerning their current employment status The university grants a wide variety of different degrees and wants to make sure that b information is obtained about graduates from each of the degree types A 5 sample of bns teasteb gniwollel silt sebleno 8 alumni is considered sufficient 936la b The Environmental Protection Agency EPA is required to inspect landfills in the United States for the presence of certain types of toxic material The materials were sealed in containers and placed in the landfills The exact location of the containers is no longer known The EPA wants to inspect a sample of 100 containers from the 4 000 containers known to be in the landfills to determine if leakage from the containers has occurred

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