Two separate samples receive different treatments. After treatment, the first sample has n=5 with SS=60, and the second has n=9 with SS=84. Compute the pooled variance for the two samples. Calculate...

Two separate samples receive different treatments. After treatment, the first sample has n=5 with SS=60, and the second has n=9 with SS=84.

1. 
   

   Compute the pooled variance for the two samples.

   
   


2. 
   

   Calculate the estimated standard error for the sample mean difference.

   
   


3. 
   

   If the sample mean difference is 7 points, is this enough to reject the null hypothesis using a two-tailed test with a=.05?