Question

Find the critical value t a/2 needed to construct a confidence interval of the given level with th sample size. Round the amswers to theee decimal places.

For level 95% and sample size 11?

For level 98% and sample size 26?

For level 99% and sampke size 12?

Answer 1

Find the critical value t a/2 needed to construct a confidence interval of the given level with th sample size. Round the amswers to theee decimal places.

( For this question we need to use t critical value table )

## For level 95% and sample size 11?

Answer : degree of feedom = ( n-1 ) = 10

critical value = t ( a/2,10 ) = +/- 2.228

( T-Value (two-tailed): +/- 2.228138 )

## For level 98% and sample size 26?

Answer : degree of feedom = ( n-1 ) = 25

critical value = t ( a/2, 25) = +/- 2.485

( T-Value (two-tailed): +/- 2.485107 )

## For level 99% and sampke size 12?

Answer : degree of feedom = ( n-1 ) = 11

critical value = t ( a/2, 11) = +/- 3.106

( T-Value (two-tailed): +/- 3.105803)