Pls help will give brainlist
2 answers:
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Answer:
Step-by-step explanation:
We know that , so we need to multiply equation
by
.
This gives , which simplifies to
.
We know that , so we need to multiply equation
by
.
This gives , which simplifies to
.
Aha! Now we have a path to the solution!
We can subtract the first equation from the second to eliminate .
This gives , which simplifies to
.
We can then divide by to obtain
!
Then, we plug into the second equation to get
.
We can subtract from both sides to get
.
We then divide by to obtain
.
So, and
, and we're done!
Answer:
(351.04, 368.96)
Step-by-step explanation:
Given that population mean= 360
Std devitaion = 4
margin of error = 2.5%= 0.025
Since population std deviation is known we can use Z critical value
For two tailed critical value for 2.5% would be
2.24
Margin of error = ±Critical value*std deviation
= ±2.24(4)
= ±8.96
Confidence interval =(Mean - margin of error, mean + margin of error)
=