Assume a researcher is interested in the effects of listening to music while studying for an exam

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Assume a researcher is interested in the effects of listening to music while studying for an exam. She randomly selects students from her Introduction to Psychology course to participate. 14 students are asked to listen to music of their choice while studying and 12 are asked to not listen to any music while they study. Assume that the exam results for the population are normally distributed. Conduct the 4-step hypothesis test, and calculate and interpret the confidence interval, assuming α = .05. 

Music Listeners:                                  Non-music listeners:

sample mean = 86.2                    sample mean = 89.3

s = 9.8                                                              s = 8.1

n = 13                                                               n = 12