(1 point) To construct a confidence interval for a population mean with unknown

Question

(1 point) To construct a confidence interval for a population mean with unknown population standard deviation ?, find the critical t-score value for each of the following confidence levels, assuming a sample size of 18. Give each answer to at least three decimal places. . The t-critical value for a(n) 90% confidence level is: . The t-critical value for a(n) 80% confidence level is: The t-critical value for a(n) 95% confidence level is: . The t-critical value for a(n) 98% confidence level is: . The t-critical value for a(n) 99% confidence level is:

Explanation / Answer

givne n=18

degrees of freedom is=n-1=17

a) alpha=10% and t critical value=1.740

b) alpha=20% and t critical value=1.333

c) alpha=5% and t critical value=2.110

d)  alpha=2% and t critical value=2.567

e)  alpha=1% and t critical value=2.898

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