B cause it's true if you look at the graph
        
             
        
        
        
Using the z-distribution, it is found that the 95% confidence interval for the difference is (-1.3, -0.7).
<h3>What are the mean and the standard error for each sample?</h3>
Considering the data given:


<h3>What is the mean and the standard error for the distribution of differences?</h3>
The mean is the subtraction of the means, hence:

The standard error is the square root of the sum of the variances of each sample, hence:

<h3>What is the confidence interval?</h3>
It is given by:

We have a 95% confidence interval, hence the critical value is of z = 1.96.
Then, the bounds of the interval are given as follows:
More can be learned about the z-distribution at brainly.com/question/25890103
#SPJ1
 
        
             
        
        
        
I dont really the answer i am sorry i am hust writing this response to get points and ask questions
        
             
        
        
        
Answer:
Point C
Step-by-step explanation:
because the number is 0.3 you need to start at zero on the number line and go forward 3 marks. That will lead you to your answer of 0.3
 
        
                    
             
        
        
        
Answer:
-4<x<2
Step-by-step explanation:
If you have any questions about the way I solved it, don't hesitate to ask ÷)