How do you find the critical value on a calculator? I understand where the 0.05

Question

How do you find the critical value on a calculator? I understand where the 0.05 comes from and the df = 17 but how do you get the answer 1.740 with that information on a calculator? (With out looking at a t- table) 90% CI for ? using t-dist Sample Mean = 56 Sample Standard deviation = s = 31 Sample Size = n = 18 Significa lice level-a-1-0.9-0.1 ,Degrees of freedom for t-distribution, d.f. = n-1-17 Critical Value-ta/2.df = t0.05?17 = 1.740 (frorn t-lible, two-tails, d.f.-17 31 Margin of Error-E-ta/24 E= 1.740 × 7.30677 f ×??. I.740x T V18 Margin of Error, E12.71378

Explanation / Answer

We can calculate the t vale using MS Excel with function TINV

it calculates the t value. We have to give enter probability = 0.05 and degrees of freedom=17.

and will get the desired answer.

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