A publishing company has developed a study guide (reference book) for GRE The company recruited a random sample of students who are planning to take hypothesis that the students' mean score is not different from the national avera indicates that the average score for the population is 68.5. Scores: 70, 68, 93, 78, 73, 99, 81, 79, 61 (1) Set up hypotheses ( (2) What is the df and the critical value for this test? (3) What is the standard error for this test? (4) What is the t observed for this test? (.

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