The formula used to compute a confidence interval for the mean of a normal popul

Question

The formula used to compute a confidence interval for the mean of a normal population when n is small is the following.

What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Round the answers to two decimal places.)

(a) 98% confidence, n = 17


(b) 90% confidence, n = 12


(c) 98% confidence, n = 24


(d) 90% confidence, n = 24


(e) 80% confidence, n = 13


(f) 95% confidence, n = 10

The formula used to compute a confidence interval for the mean of a normal population when n is small is the following. x plusminus (t critical value) 8/ What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Round the answers to two decimal places.) 98% confidence, n = 17 90% confidence, n = 12 98% confidence, n = 24 90% confidence, n = 24 80% confidence, n = 13 95% confidence, n = 10

Explanation / Answer

a)
Critical Value
The Value of |t ?| with n-1 = 16 d.f is 2.24
b)
Critical Value
The Value of |t ?| with n-1 = 11 d.f is 1.36
c)
Critical Value
The Value of |t ?| with n-1 = 23 d.f is 2.18
d)
Critical Value
The Value of |t ?| with n-1 = 23 d.f is 2.5
e)
Critical Value
The Value of |t ?| with n-1 = 12 d.f is 0.87
f)
Critical Value
The Value of |t ?| with n-1 = 9 d.f is 1.83

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