Please help with 16 and 17 those are hard
1 answer:
You might be interested in
Answer:
The 95% confidence interval for the population mean is between 61.5 and 68.5.
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 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 65 - 3.5 = 61.5
The upper end of the interval is the sample mean added to M. So it is 65 + 3.5 = 68.5
The 95% confidence interval for the population mean is between 61.5 and 68.5.
Answer:
(9, 5
) or (9 1/2, 5 1/2) (same things, just typed two different ways)
Step-by-step explanation
I can't remember the midpoint formula so I'll use a different method to get the midpoint.
since the ratio of a midpoint is 1:1 and that as a fraction is 1/2, we can take these coordinates and designate which one is first and which one is second (12, 2) will be my second and (7,9) will be my first. The formula I will use will be , so 1/2( 12 - 7) +7. now distribute the 1/2 to both the numbers
or
. The same works with the Y values, which would equal up to 5.5 or 5