The following results are for independent random samples taken from two populations.
Sample 1  Sample 2 
n_{1} = 20  n_{2} = 30 


s_{1} = 2.5  s_{2} = 4.8 
a.
Find the point estimate of the difference between the two population means.
Calculation:
The results of two independent random samples drawn from two populations are as follows:
Sample 1  Sample 2 
b.
Find the degrees of freedom for the t distribution.
c.
Find the margin of error at 95% confidence.
d.
Find the 95% confidence interval for the difference between the two population means.
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