Question 1173037
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Hi, 
c=0.98​,x=4.1 ​, o=0.4 ​, and n=49
df = 49-1 = 48 , c=0.98​ 
Using online Calculator/above values for t-value:   z= 2.4066 (t-critical value)
ME ={{{ z*sigma/sqrt(n)}}}
ME ={{{ 2.4066*s.4/sqrt(49)}}} = 2.315
4.1- 2.3 < {{{mu}}} < 4.1 + 2.3
1.8 < {{{mu}}} <6.4
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