Answer:
a. With 90% confidence the proportion of all Americans who favor the new Green initiative is between 0.6290 and 0.6948.
b. If the sample size is changed, the confidence interval changes as the standard error depends on sample size.
About 90% percent of these confidence intervals will contain the true population proportion of Americans who favor the Green initiative and about 10% percent will not contain the true population proportion.
Step-by-step explanation:
We have to calculate a 90% confidence interval for the proportion.
The sample proportion is p=0.6619.

The standard error of the proportion is:

The critical z-value for a 90% confidence interval is z=1.6449.
The margin of error (MOE) can be calculated as:

Then, the lower and upper bounds of the confidence interval are:
The 90% confidence interval for the population proportion is (0.6290, 0.6948).
Answer:
x=y=z=90.
Step-by-step explanation:
let the 3 numbers be x,y,z.
let s be sum
s=x+y+z
we need to maximize xy+yz+zx
or , xy + y(270-(x+y))+x(270-(x+y)) = P(x)
Use Lagrange's Multipliers
⇒ΔP= λΔS
⇒
⇒y=x
⇒\frac{x+z}{x+y} =1
⇒z=y
⇒x=y=z
⇒3x = 270
⇒x= 90
hence, x=y=z=90.
Answer:
A. picking a red rose from a vase with two red, two pink, two yellow, and two white roses
Step-by-step explanation:
please mark this answer as brainlest
Answer:
Part 26) 
Part 27) 
Step-by-step explanation:
Part 26)
we know that
The length of Alana's hair was 9 3/4 inches
After her haircut, the length was 6 1/2 inches
To find out how many inches did she have cut subtract 6 1/2 from 9 3/4
but first
Convert mixed number to an improper fraction


Find the difference

Convert to mixed number

Part 27)
we have that
Emeril used a total of 7 1/4 cups of flour to make three pastries
He used 2 1/4 cup of flour for the first and 2 1/3 cups of flour for the second
To find out how much cups of flour Emeril use for the third pastry, subtract the sum of the cups of flour used in the first and second pastry from the total cups of pastry used
Let
x ----> number of cups of flour used in the third pastry

but first
Convert mixed number to an improper fraction



substitute




Simplify

Convert to mixed number
