Answer:
The 99% confidence interval of the population standard deviation is 1.7047 < σ < 7.485
Step-by-step explanation:
Confidence interval of standard deviation is given as follows;

s =  
 
Where:
 = Sample mean
 = Sample mean
s = Sample standard deviation
n = Sample size = 7
χ = Chi squared value at the given confidence level
 = ∑x/n = (62 + 58 + 58 + 56 + 60 +53 + 58)/7 = 57.857
 = ∑x/n = (62 + 58 + 58 + 56 + 60 +53 + 58)/7 = 57.857
The sample standard deviation s =  = 2.854
 = 2.854
The test statistic, derived through computation, = ±3.707
Which gives;


1.7047 < σ < 7.485
The 99% confidence interval of the population standard deviation = 1.7047 < σ < 7.485.
 
        
             
        
        
        
Answer:
1.36
Step-by-step explanation:
 
        
             
        
        
        
The answer is C. park users are more likely to be willing to pay more to improve parks
        
                    
             
        
        
        
It the second one. the net for a square pyramid.
        
             
        
        
        
Answer:
18/25
Step-by-step explanation:
=54÷375÷3=18/25
=18/25