2011_SS1_Homework 06 - Solutions

# The first sample has n9 with ss710 and the second

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Unformatted text preview: s SS = 48 and a second sample has SS=32. Assuming n=5 for both samples, find the pooled variance estimate. SS 48 SS 32 2 s12 = , s12 = , s12 = 12 s2 = , s12 = , s12 = 8 n !1 4 n !1 4 SS + SS1 48 + 32 80 s 2 ed = 1 , s 2 ed = , s 2 ed = , s 2 ed = 10 pool pool pool pool df1 + df2 4+4 8 15) In a different two ­sample study, one sample has SS = 48 with n=5, and a second sample has SS=32 with n = 9. Find the pooled variance estimate. SS 48 SS 32 2 , s12 = , s12 = 12 s2 = , s12 = , s12 = 4 n !1 4 n !1 8 SS + SS1 48 + 32 2 80 s 2 ed = 1 , s 2 ed = , s pooled = , s 2 ed = 6.667 pool pool pool df1 + df2 4+8 12 16) Two separate samples receive two different treatments. The first sample has n=9 with SS=710, and the second sample has n=6 with SS = 460. Using this information, calculate the estimated standard error of the mean difference that we would use to calculate the t ­ statistic. Note: Remember that you...
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