A random sample of n = 9 individuals is obtained from the population with mean of µ = 80, the population variance is unknown. Researcher wants to if listening to Mozart Music enhances spatial skills. Mozart music is administered to each individual in the sample for 20 minutes. After which each individual is given the spatial task. The average score for treated sample is M = 86 with SS = 288. Alpha level is set at .01
What decision should the researcher make?