A sample of  10  students took a class designed to improve their SAT math scores. Following are their scores before and after the class. Can you conclude that the mean increase in scores differs from  15  points? Let  μ1  represent the mean score after the class and  =μd−μ1μ2 . Use the  =α0.05  level and the  P -value method with the TI-84 Plus calculator.   Score Before 334 378 467 470 473 382 473 408 433 478 After 368 396 488 489 473 382 474 407 434 490

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