We need to find out how many adults must the brand manager survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage.
From the given data we know that our confidence level is 90%. From Standard Normal Table we know that the critical level at 90% confidence level is 1.645. In other words,  .
.
We also know that E=5% or E=0.05
Also, since,  is not given, we will assume that
 is not given, we will assume that  =0.5. This is because, the formula that we use will have
=0.5. This is because, the formula that we use will have  in the expression and that will be maximum only when
 in the expression and that will be maximum only when  =0.5. (For any other value of
=0.5. (For any other value of  , we will get a value less than 0.25. For example if,
, we will get a value less than 0.25. For example if,  is 0.4, then
 is 0.4, then  and thus,
 and thus,  .).
.).
We will now use the formula

We will now substitute all the data that we have and we will get



which can approximated to n=271.
So, the brand manager needs a sample size of 271
 
        
             
        
        
        
Answer:
impossible
Step-by-step explanation:
X + X + 1 + X + 2 = 56. To solve for X, you first add the integers together and the X variables together. Then you subtract 3 from each side, followed by dividing by 3 on each side. ...
3X + 3 = 56. 3X + 3 - 3 = 56 - 3.
3X = 53. 3X/3 = 53/3.
X = 17 2/3. Since 17 2/3 is not an integer, there is no true answer to this problem.
 
        
             
        
        
        
Answer:
B) 13
Step-by-step explanation:
Average age means to calculate mean:
Mean = (Sum of all numbers)/(Number of numbers)
Mean = (14 + 14.5 + 12 + 11.5 + 15 + 13 + 10.5 + 13.5)/8
Mean = (104)/8
Mean = 13
 
        
             
        
        
        
Answer:
A
Step-by-step explanation: