Answer:
B (0.312, 0.364)
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of  , and a confidence interval
, and a confidence interval  , we have the following confidence interval of proportions.
, we have the following confidence interval of proportions.

In which
z is the zscore that has a pvalue of 
For this problem, we have that:
1289 randomly selected American adults responded to this question. This means that  .
.
Of the respondents, 436 replied that America is doing about the right amount. This means that  .
.
Determine a 95% confidence interval for the proportion of all the registered voters who will vote for the Republican Party. 
So  , z is the value of Z that has a pvalue of
, z is the value of Z that has a pvalue of  , so
, so  .
.
The lower limit of this interval is:

The upper limit of this interval is:

The 95% confidence interval is:
B (0.312, 0.364)
 
        
             
        
        
        
Answer:
I THINK IM WRONG BUT
Step-by-step explanation:
X3 NUZZELS POINCES ON U
 
        
             
        
        
        
Answer:
20 students
Step-by-step explanation:
If the class decreased by 15%, the students that she has now (17) represents a percentaje of: 
100% - 15% = 85% 
so<u> the 17 students are 85% of what she had</u>:
Students         Percentage
       17          ⇒        85%
and we are looking for how many students she had 2 years ago, thus we are looking for the <u>100%</u> of students (the original number of studens). If we represent this number by x: 
Students         Percentage
       17          ⇒        85%
       x          ⇒        100%
and we solve this problem using the <u>rule of three</u>: multiply the cross quantities on the table( 17 and 100) and then divide by the remaining amount (85): 
x = 17*100/85
x = 1700/85
x=20
2 years ago she had 20 students
 
        
             
        
        
        
Answer:
The answer is 4a-12
Step-by-step explanation:
Hope this helped :>