Question 1173036
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Hi, 
c​=0.95, o=3.9 ​, n=100
df = 100-1 = 99 , c=0.98​ 
Using online Calculator/above values for t-value:   z= 1.98 (t-critical value)
ME ={{{ z*sigma/sqrt(n)}}}
ME ={{{1.98*3.9/sqrt(100)}}} = .77
Assuming mean = 0
-.77 < {{{mu}}} < .77
ONe may use charts or online calculators for t-values used for small samples
For Large Samples, following z-values are used
 = CI	z = value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576