Question

Samples are taken from two independent populations, and the following statistics are computed: n1=50, x bar 1=175 , s1=20.5, n2=42, x bar 2=158, s2=34.9. If these samples are to be used to test for a difference between the means of the two populations, how many degrees of freedom does the appropriate test statistic have?

Answer 1

good questio but i can't answer

Answer 2

its's okay

Answer 3

i found the answer.

Answer 4

Check your text. Maybe it will be the smaller of (sample size One - 1) and (sample size Two - 1) and not the "more precise" one attached.

http://stattrek.com/hypothesis-test/difference-in-means.aspx