Answer: true
Step-by-step explanation:
Z-tests are statistical calculations that can be used to compare the population mean to a sample mean The z-score is used to tellsbhow far in standard deviations a data point is from the mean of the data set. z-test compares a sample to a defined population and is typically used for dealing with problems relating to large samples (n > 30). Z-tests can also be used to test a hypothesis. Z-test is most useful when the standard deviation is known.
Like z-tests, t-tests are used to test a hypothesis, but a t-test asks whether a difference between the means of two groups is not likely to have occurred because of random chance. Usually, t-tests are used when dealing with problems with a small sample size (n < 30).
Both tests (z-tests and t-tests) are used in data with normal distribution (a sample data or population data that is evenly distributed around the mean).
 
        
             
        
        
        
Answer:
Distributive Property
Step-by-step explanation:

 
        
             
        
        
        
Answer:
20/5 = x /4 x = 80/5 = 16
x - 10 / 39 = 5/15 = 1/3
3x - 30 = 39
3x = 69
x = 23
(2x + 10 ) * 4 = 10 *(x + 3)
8x + 40 = 10x + 30
2x = 10 
x = 4.
AE = 2(5) + 10 = 20, hope this helped.
 
        
                    
             
        
        
        
Answer: 11 
Step-by-step explanation:
30 - 2(7+2)- 1        Distribute or  solve parentheses 
30 - 14 -4 - 1  
30 - 19 = 11   
 
        
             
        
        
        
B is the answer how you do good