SAT Services advertises that 80 percent of the time, its preparatory course will increase an individual’s score on the College Board exams by at least 50 points on the combined verbal and quantitative total score. Lisle Johns, SAT’s marketing director, wants to see whether this is a reasonable claim. He has reviewed the records of 125 students who took the course and found that 94 of them did, indeed, increase their scores by at least 50 points. Use prob values to determine whether SAT’s ads should be changed because the percentage of students whose scores increase by 50 or more points is signifi cantly different from 80 percent.
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