Answer:
I think x = 1.5
Step-by-step explanation:
23 - 17 = 6
6 ÷ 4 = 1.5
Answer:
middle left
Step-by-step explanation:
Answer:
ANd?
Step-by-step explanation:
Answer:
nearest number
Step-by-step explanation:
Answer:
A sample size of 35 is needed.
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 width W as such

In which
is the standard deviation of the population and n is the size of the sample.
How large must the sample size be if the width of the 95% interval for mu is to be 1.0:
We need to find n for which W = 1.
We have that
, then
. So





Rounding up
A sample size of 35 is needed.