Question

In the process of developing corrosion-free rebars for reinforcing concrete, the bod strength for glass-fiber-reinforced plastic rebars to concrete was measured for 48 randomly selected samples of the product resulting in a mean bond strength of 7.767 and a standard deviation of 4.988. What is the value of the estimated standard error of X ¯for this sample?

Answer 1

Solution :

Given that ,

mean =   = 7.767

standard deviation = = 4.988

n = 48

standard error = =  / n =4.988 / 48=0.7200