Answer:
a) The confidence interval is
.
Step-by-step explanation:
We have to calculate a confidence interval (CI) of a difference of proportions.
For the existing procedure, the proportion is:

For the new procedure, the proportion is:

To calculate the CI, we need to estimate the standard deviation

For a 90% CI, the z-value is 1.64.
Then, the CI is:

Answer:
I can't help.
Step-by-step explanation:
There is no question, so therefore, I can not help.
The answer to the question is 90
Answer:
<h3>The answer is option D.</h3><h3 /><h3>3</h3>
Step-by-step explanation:
From the table above f(-2) = 3
Hope this helps you