Data;
n=31
x=33
s=2
Critical value
Use t-score with degrees of freedom (df) of n-1
df=31-1=30
Critial value: 2.45726
Multiply the critical value by the standard deviation (s):
[tex]2.45726\times2=4.91452[/tex]Then, the margin of error at 98% confidence is 4.91
