# Homework Help: Trouble of getting t-value from t-distribution table

1. Dec 3, 2017

### tzx9633

1. The problem statement, all variables and given/known data
How to find percentage = 0.05 , while v = 45 using t -distribution table ?

2. Relevant equations

3. The attempt at a solution
Should i use interploation or just use percentage = 0.05 , while v = 50 to get the t value for percentage = 0.05 , while v = 45 ???

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2. Dec 3, 2017

### tzx9633

I think i should just use use percentage = 0.05 , while v = 50 , correct me if i am wrong

3. Dec 3, 2017

### Ray Vickson

It might be OK in practice, but is not really correct. We have $t(40) = 1.684$ but $t(45) = 1.679$. However, both of these round to the same value $1.68$ to three significant figures. So: you decide!

There are better tables available on-line; it just needs you to do a search.

4. Dec 3, 2017

### tzx9633

how about $t(50)$ ??? can i use this ?

5. Dec 3, 2017

You tell me.