The Automobile Association of America claimed the average number of years car owners keep their car to be 7.25 years. A sample of 100 randomly selected car owners are surveyed. The output below shows the analysis based on the sample data. what is the marginof error for a 95% confidence interval?

	Sample Data	Hypothesized Mean
Mean	7.120	7.25
Variance	0.778	0
Observations	100	100
Hypothesized Mean Difference	0
df	99
t Stat	-1.580
P(Tt) one-tail	0.059
t Critical one-tail	1.660
P(Tt) two-tail	0.117
t Critical two-tail	1.984