Answer:
(0.4958, 0.7422)
Step-by-step explanation:
Let p be the true proportion of water specimens that contain detectable levels of lead. The point estimate for p is
. The estimated standard deviation is given by
. Because we have a large sample, the 90% confidence interval for p is given by
where
is the value that satisfies that above this and under the standard normal density there is an area of 0.05. So, the confidence interval is
, i.e., (0.4958, 0.7422).
I hope this helps you understand the steps to get your answer...
The length of ab is D. 15
Answer:
Step-by-step explanation:
Ok so it’s NOT 10-20 so the closest answer towards it is 5-15 but ik wrog so idk