08 Jul 2024

Posted on:

30 Aug 2023

0

# Resolved:T- score used in the solution is for alpa, not divided by 2. Why

Please am confused with how to check the t-score table. The video shows that you divide the alpha by 2 e.g alpha is 0.05, divide by 2 which gives  0.025.

We are supposed to check 0.025 against the degree of freedom, to get the intersect.

But solution keeps using the alpha figure(without dividing it by 2).

Posted on:

30 Oct 2023

0

Hi,

Which solution?
in the exercise solution file, t-statistics for alpha (0.05/2) or (alpha 0.025) is correct -> 2.26.

Posted on:

08 Jul 2024

0

Hi there, a 95% CI suggests that we need to capture 95% of data inbetween 2 points. Therefor we need 2.5% of the data to the left of the lower point, 95% of data within the two points and 2.5% of data above the higher point. This is why for a 2 tail test we need to consider alpha/2. If this was a 1-tail test then this suggests there is a strict known value for a lower bound like 0 of +/- infinite, therefor we would want to have 95% data below the upper value and 5% data above this value for a 95% CI.