Trouble of getting t-value from t-distribution table

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Homework Help Overview

The discussion revolves around finding the t-value from a t-distribution table for a specific percentage and degrees of freedom. The original poster is trying to determine how to approach the problem of finding the t-value for a significance level of 0.05 with 45 degrees of freedom.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss whether to use interpolation or to reference the t-value for 50 degrees of freedom instead. There is also a consideration of the accuracy of using t-values from different degrees of freedom.

Discussion Status

Participants are exploring different approaches to find the t-value, with some suggesting the use of t-values for 50 degrees of freedom. There is a recognition of potential inaccuracies in this approach, but no consensus has been reached on the best method to use.

Contextual Notes

There is mention of the availability of better tables online, indicating that participants are considering the reliability of their sources for t-values.

tzx9633

Homework Statement


How to find percentage = 0.05 , while v = 45 using t -distribution table ?

Homework Equations

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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I think i should just use use percentage = 0.05 , while v = 50 , correct me if i am wrong
 
tzx9633 said:
I think i should just use use percentage = 0.05 , while v = 50 , correct me if i am wrong

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.
 
Ray Vickson said:
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.
how about ##t(50) ## ? can i use this ?
 
tzx9633 said:
how about ##t(50) ## ? can i use this ?
You tell me.
 

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