Simple calculations give minus in environment

When using the following simple code for calculating the confidence interval it gives minus in the environment while it should be postive.
#Calculate the confidence interval

SE <-- 4.466389/sqrt(5122)
sqrt_value <- sqrt(5122)
SE <- 4.466389 / sqrt_value
#Calculate the lowerbound
LB <-- 25.77734-1.96*SE

It gives -25.899 in the environent. Can someone help me with that?

when you used two -- in the assignment operator <- in stead of one, you inverted the sign

a <-- 1
[1] -1


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