Answer:
153.86
Step-by-step explanation:
Do 3.14 times 7 to the power of 2
Hope this helps
Answer:
9x^4+5x^2-2x-13
Step-by-step explanation:
Answer:
1/12 yards
Step-by-step explanation:
5×1/6 yards = 5/6 yards
5/6 yards - 3/4 yards = 10/12 yards - 9/12 yards
= 1/12 yards
Answer:
A 90% confidence interval for the mean number of letter sounds identified in one minute is: (30.84, 37.34).
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
.
That is z with a pvalue of
, so Z = 1.645.
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 34.09 - 3.25 = 30.84.
The upper end of the interval is the sample mean added to M. So it is 34.09 + 3.25 = 37.34.
A 90% confidence interval for the mean number of letter sounds identified in one minute is: (30.84, 37.34).