Answer: 2.093
Step-by-step explanation:
As per give , we have
Sample size : n= 20
Degree of freedom : df= n-1=19
Significance level : [tex]\alpha: 1-0.95=0.05[/tex]
Since , the sample size is small (n<30) so we use t-test.
For confidence interval , we find two-tailed test value.
Using students's t-critical value table,
Critical t-value : [tex]t_{\alpha/2, df}=t_{0.025,19}=2.093[/tex]
Thus, the critical value for the 95% confidence interval = 2.093
