A random sample of 5200 permanent dwellings on an entire reservation showed that 1571 were traditional hogans.
2 answers:
Given that
A random sample of 5200 permanent dwellings on an entire reservation showed that 1571 were traditional hogans.
Sample proportion p =
p follows a normal distribution with mean = 0.3021 and variance
=
std dev of p=0.00462
For 99% confidence level we use Z critical value 2.58
Margin of errror = 2.58 (std error) =0.0119
Confidence interval lower bound = 0.3021-0.0119 =0.2902
Upper bound = 0.3021+0.0119 =0.3140
You might be interested in
You can solve this in two ways.
1. Graphical. Plot the graph for x between -5 and 1 (see attachement).
The vertex of the graph is the peak of the curve, which has the coordinates x=-2, y=-9.
2. Analytical. Calculate the derivative of the function f(x)
Solve the equation:
will give the solution x=-2.
Replace x=-2 in the f(x) function and you'll get the value of y:
You get the same answer: x=-2, y=-9
So the answer is
<span>B. (-2, -9)</span>
1. Graphical. Plot the graph for x between -5 and 1 (see attachement).
The vertex of the graph is the peak of the curve, which has the coordinates x=-2, y=-9.
2. Analytical. Calculate the derivative of the function f(x)
Solve the equation:
will give the solution x=-2.
Replace x=-2 in the f(x) function and you'll get the value of y:
You get the same answer: x=-2, y=-9
So the answer is
<span>B. (-2, -9)</span>