Confidence Intervals for Independent Samples t-Test

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In this video for independent samples You're using the smaller of df1 OR df2 to find t values - HOWEVER- in your other video on the same topic (independent variables, CI calculation) you use df= df1+df2 to find t values. These are grossly different distributions- which is right?

paulabenyei
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Should the (d/f=58) then be divided by 2. As stated "t a/2"=29. Then we can use the "t" table, correct?

albertnava
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while calculating t value you use alpha at 0.05 ..sudnt it be divided by 2 so making it..0.025 as in formula it alpha divided by 2..or am i not getting it, , cud u plz explain it

pritikakhatri
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Wrong, it is a two sample test which requires you add the def less 2. why use only one df? or you have used it under what assumption?

johnsonokeyo
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What happened if the n value is different.
For example n1 is 12 and n2 is 10.
How to calculate the lower and upper boundary?

niafarquem
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When it t dist must use S²p not s1.s2 ???

lanasaleh
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why in the fuck is 29 the degree of freedom

carsonraeder