Using the z-distribution, it is found that 3,007 passengers must be surveyed.
<h3>What is a confidence interval of proportions?</h3>
A confidence interval of proportions is given by:
In which:
- is the sample proportion.
The margin of error is given by:
In this problem, we have a 90% confidence level, hence, z is the value of Z that has a p-value of , so the critical value is z = 1.645.
In this problem, we desired a margin of error of M = 0.015, with no prior estimate, hence , then we solve for n to find the minimum sample size.
n = 3007.
More can be learned about the z-distribution at brainly.com/question/25890103
#SPJ1
Answer:
- (-∞, ∞)
- (-∞, 3) ∪ (5, ∞)
- (2, 6)
Step-by-step explanation:
a) f(x) > 0 for all x: (-∞, ∞)
__
b) f(x) > 4 for x < 3 and x > 5: (-∞, 3) ∪ (5, ∞)
__
c) f(x) < 5 for 2 < x < 6: (2, 6)
_____
<em>Comment on the notation</em>
The brackets are round brackets (parentheses) because the end points are not included in the interval. The first number corresponds to the left end of the interval on the number line. The second number corresponds to the right end of the interval on the number line. When intervals are disjoint, their union is indicated with the appropriate symbol.
If the end number is included in the interval, a square bracket is used:
1 < x ≤ 3 ⇒ (1, 3]
Answer:
1. A 2. B
Step-by-step explanation:
1. 9(6 times x) and 9 x 6 + 9 times x
Thhis is correct because you do the same for both
2. 1 pound is 16 ounces. So 12.5 x 16 = 200
Answer: 8000
Step-by-step explanation: do you really need the explanation? i think you are just panicking about a test/late hw assignment lol
ok well you just take the overall percentage and make a table, then with that table form an equation, make plant b your x and solve for x
Answer:
(x - 2)^2 + (y + 5)^2 = 5
Step-by-step explanation:
If the center is at (h, k) : (2, -5), then the general form of the equation of this circle is
(x - 2)^2 + (y + 5)^2 = r^2, and we must find r^2.
We know that (3, -3) is a point on the circle. Substitute 3 for x and -3 for y in the above equation to find r^2:
(3 - 2)^2 + (-3 + 5)^2 = r^2, or
1^2 + 2^2 = r^2
Then r^2 = 5, and the desired equation is
(x - 2)^2 + (y + 5)^2 = 5 or (√5)^2