Answer:
The margin of error for a 99% confidence interval for the population mean is 1.8025.
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 Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
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.
In this problem:
So
The margin of error for a 99% confidence interval for the population mean is 1.8025.
Answer:
d) 2/5
Step-by-step explanation:
4/10 = 2/5
0, 1/10, 2/10, 3/10, 4/10, 5/10, 6/10, 7/10, 8/10, 9/10, 1
Hope this helps!
D, since X has only one box and is negative.
Answer:
Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation ( or direct variation) if it can be expressed in the form 
or 
In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin
we have the point (6,-2)
so
Find the constant of proportionality k
Simplify
therefore
The equation of the direct variation is
Put this in English then I can help you
