If the discriminant of a quadratic equation is positive, which of the following is true of the equation?
2 answers:
For this case suppose that we have a quadratic equation of the form:
The solution to the quadratic recuacion is given by:
Where,
The discriminant is:
When the discriminant is greater than zero, then the root is positive, and therefore, we have two positive real solutions.
Answer:
B. it has two real solutions
The solution to the quadratic recuacion is given by:
Where,
The discriminant is:
When the discriminant is greater than zero, then the root is positive, and therefore, we have two positive real solutions.
Answer:
B. it has two real solutions
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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).