Answer:
(3.387 ; 4.013)
Step-by-step explanation:
Confidence interval :
Xbar ± standard Error
Standard Error = Zcritical * s/√n
n = 50 ; s = 1.13 ; xbar = 3.70
Zcritical at 95% = 1.96
Standard Error = 1.96 * 1.13/√50
Standard Error = 0.3132200
Lower boundary : (3.70 - 0.313) = 3.387
Upper boundary : (3.70 + 0.313) = 4.013
(3.387 ; 4.013)