Answer:



Step-by-step explanation:
Given

Solving (a): Point estimate of difference of mean
This is calculated as: 


Solving (b): 90% confidence interval
We have:


Confidence level is: 



Calculate 


The z score is:

The endpoints of the confidence level is:






Split


Hence, the 90% confidence interval is:

Solving (c): 95% confidence interval
We have:


Confidence level is: 



Calculate 


The z score is:

The endpoints of the confidence level is:






Split


Hence, the 95% confidence interval is:

Ok so u wanna do the equation regularly and then u want to divide the top and bottom by 2 as much as u can but when u can’t divide one by 2 you can’t divide the other one either that’s when u stop
Answer:
its complemtary
Step-by-step explanation:
check this photo
C if u need a step-by-step just comment
Answer:
1. the two top drawings
2. B, C
Step-by-step explanation:
1. the two top drawings
2. B, C