asstatistics help pls

The amount of contaminants in two independent samples (comprised of independent subjects) from two distinct bird species is measured in a veterinary hospital. The summary of the data is presented below. Data from Pop. 1 |Data from Pop. 2 n1=13 n2=15 1=1.12 2=1.49 $1=0.52 $2=0.70 We are interesting in testing Ho : M1 - /2 = 0, versus Ha : /1 - 12 # 0. And we will make the normality assumption. (a) Suppose that we know the population variances: of = 0.1, 0? = 0.2. Design the test and find its pvalue. What conclusion do you reach at significance level 5%? (b) Suppose that the researchers do not trust these population vari- ance values, and would like to do the test based on the sample variances provided above. Assuming equal variance, how would your conclusions changed