![]() ![]() ![]() ( Friday's ) nominal rates for sterling exchange Twin City Ray Tran, pl. (Hint: Go to AP Statistics Semester 2 TEST and choose 0: 2-SampTInt. Jan Gt Northern subscript'n receints 95rrid. She takes a random sample of final grades from her two most recent first- and second-semester classes and gets these data: First semester: (89, 98, 78, 86, 95, 83, 90, 87, 85, 80, 96, 93, 90, 91, 81, 87, 93, 90, 87, 88) Second semester: (87, 85, 89, 78, 79, 77, 82, 90, 91, 93, 88, 87, 86, 83, 85, 81, 90, 86, 86, 84) She computes these sample statistics: x with bar on top subscript 1 equals 88.35 comma space s subscript 1 equals 5.314 comma space n subscript 1 equals 20 x with bar on top subscript 2 equals 85.35 comma space s subscript 2 equals 4.368 comma space n subscript 2 equals 20 Using your TI-83 calculator, construct a 99% confidence interval for the difference between these two populations. Julie wants to know if the grades in her first-semester classes differ significantly from those of her second-semester classes. A statistics professor has been teaching first- and second-semester statistics for five years. ![]()
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