Answer:
The 85% confidence interval is (0.2187, 0.2613).
Step-by-step explanation:
We have a large sample of size n = 830 Americans over 45. We have observed that 631 people don't smoke. Let p be the population proportion of Americans over 45 who smoke. An point estimate of p is
and an estimate of the standard deviation of
is
= 0.0148. Therefore, because we have a large sample, the 85% confidence interval for the population proportion is given by
where
is the 7.5th quantile of the standard normal distribution, i.e., -1.4395. Therefore the 85% confidence interval is
or equivalently (0.2187, 0.2613).
Answer:
To find the solutions to the following questions what you would need to do is to factor out the common variable or g. Which would be the following:
g(g-4) = 45
g = 45
g2 = 49
This is more of the erraneous way to find the solution for the original one factor the expression
Step-by-step explanation:
g2 - 4g - 45 = 0
(g-9)(g+5) = 0
you can figure out what the 2 roots would be.