Effect of sample size n

n= 30

n=30    x̄=100    s=10
SEM =
CL	tc	E	CI LowerBound [	CI UpperBound ]
95%
99%

Larger n: critical values t_c, margin of error E, and the confidence interval(s).

n= 100

n=100    x̄=100    s=10
SEM =
CL	tc	E	CI LowerBound [	CI UpperBound ]
95%
99%

The larger the sample size n is the the margin of error E, and the the confidence interval(s).

Effect of sample standard deviation s.

n=10    x̄=100    s=5
SEM =
CL	tc	E	CI LowerBound [	CI UpperBound ]
95%
99%

Smaller s: critical values t_c, margin of error E, and the confidence interval(s).