A new study provides some evidence that playing action video games strength a pe
ID: 3250261 • Letter: A
Question
A new study provides some evidence that playing action video games strength a person's ability to translate sensory information into accurate decisions. Researchers had 23 volunteers with an average age of 20 look at moving arrays on computer screens and indicate the direction in which the dots moving. Half of the volunteers (11 men) reported playing action video game at least five times a week the previous year, while the other 12 reported no video game playing in the previous year. The response time and the accuracy score were both measured. A 95% confidence interval for mean response time for game players minus the mean response time for non-players is -1.8 to -1.2 seconds, while 95% confidence interval for mean accuracy score for game players minus mean accuracy score for non-players is -4.2 to +5.8. a. Interpret the meaning of the 95% confidence interval for difference in mean response time. b. Is it likely that game players and non-game players are basically the same in response time? Why or why not? If not which group is faster (with smaller response time)? c. Interpret the meaning of the 95% confidence interval for difference in mean accuracy score. d. Is it likely that game players and non-game players are basically the same in accuracy? Why or why not? If not, which group is more accurate?Explanation / Answer
a.
Interpretation :- There is a 95% probability that the difference between the mean response time for game players and the mean response time for non players lies between -1.8 to -1.2 seconds.
b.
If 0 lies in the confidence interval then there is an evidence that mean response time of both players and non players may be same. But since the whole confidence interval is negative, the mean response time of non players is higher than the mean response time of the game players. Thus the game player's groups is faster.
c.
Interpretation : There is a 95% probability that the difference between mean accuracy score for game players and non players lies in the interval (-4.2 , 5.8)
d.
Since 0 lies in the confidence interval , the evidence does not suggest that there is a difference between the mean accuracy scores of game players and non-players. Therefore we cannot say which group is more accurate.
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