In testing the difference between two population means using two independent samples, the sampling distribution of the sample mean differencex1x2is normal if the:

A.populations are non-normal and the sample sizes are large

B.populations are normal

C.sample sizes are both greater than 30

D.all of the above are required conditions

When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population proportions. If the value of the test statisticzis 2.05, thepvalue is:

A.0.4798

B.0.0404

C.0.0202

D.0.2399