Answer:
The confidence interval is 
, in which n is the size of the sample.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Z-table as such z has a p-value of 
.
That is z with a pvalue of 
, so Z = 1.96.
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 
The upper end of the interval is the sample mean added to M. So it is 
The confidence interval is , in which n is the size of the sample.
Answer:
|x y 1|
|7 -3 1| = 0
|4 -8 1|
x*(-3*1 - (-8)*1) - y*(7*1 - 4*1) + 1*(7*-8 - 4*-3) = 0
5x - 3y - 44 = 0
Step-by-step explanation:
Answer:
The answer is 2.2
Step-by-step explanation:
To find the missing number, you need to use the opposite operation to find the value of <em>n</em>:
Original equation: 1 / <em>n </em>= 2.2
New equation: 1 * 2.2 = 2.2
Answer:
The answer for y is -300.
Step-by-step explanation:
It's -300 because when you divide 125 by -25 you get -5 for the first y and x. So for the next one you just get 12 times -25 to get -300 and that's how you get your y.
