5 Critical values What critical value t from table C would y

5 Critical values. What critical value t* from table C would you use for a confidence interval for the mean of the population in each of the following situations?

(a) A 95% confidence interval base on n = 12 observation

(b) A 99% confidence interval from an SRS of 18 observations.

(c) A 90% confidence interval from a sample of size 6.

Solution

a)
The Value of |t ?| with n= 12 d.f is 1.782

b)
The Value of |t ?| with n = 18 d.f is 2.552

c)
The Value of |t ?| with n = 6 d.f is 1.44