Two independent samples of sizes 20 and 30 are randomly selected from two normally distributed populations. Assume that the population variances are unknown but equal. In order to test the difference between the population means, mu subscript 1 minus mu subscript 2 , the sampling distribution of the sample mean difference, X with bar on top subscript 1 minus X with bar on top subscript 2 , is

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.

25% is the answer

c - they will have the same distribution

step-by-step explanation:

this is the only one that could make sense. : )