Do video game players have superior visual attention skills? Refer to the Journal of Articles in Support of the Null Hypothesis (Vol. 6, 2009) study comparing the visual attention skill of video game and non-video game players, Exercise 9.22

(p. 478). Recall that there was no significant difference between the mean score on the attentional blink test of video game players and the corresponding mean for non–video game players. It is possible that selecting larger samples would yield a significant difference. How many video game and non–video game players would need to be selected in order to estimate the difference in mean score for the two groups to within 5 points with 95% confidence?

(Assume equal sample sizes will be selected from the two groups and that the score standard deviation for both groups is s ≈ 9.)