Answer:
We define the random variable X as the walking age and we are interested if American children learn to walk less than 15 months so then that would be the alternative hypothesis and the complement would be the null hypothesis.
Null hypothesis: 
Alternative hypothesis: 
And for this case the best answer would be:
 H 0 : μ ≥ 15 vs. Ha : μ < 15
Step-by-step explanation:
We define the random variable X as the walking age and we are interested if American children learn to walk less than 15 months so then that would be the alternative hypothesis and the complement would be the null hypothesis.
Null hypothesis: 
Alternative hypothesis: 
And for this case the best answer would be:
 H 0 : μ ≥ 15 vs. Ha : μ < 15
And the data given from the sample is:
 represent the sample mean
 represent the sample mean
 represent the population deviation
 represent the population deviation
 represent the sample size
 represent the sample size
And the statistic would be given by:

 
        
             
        
        
        
-0.83 for it’s the lowest number
        
             
        
        
        
Answer:
300
Step-by-step explanation:
27% = 81
1% = 81/27 = 3
100% = 100x3 = 300people
 
        
             
        
        
        
Answer:
It is 1  4/7
Step-by-step explanation:
 
        
             
        
        
        
Answer: -25 
Since x=-3, y=6, and z=-4 you have to plug those numbers into the corresponding varibale in the equation. So 3x becomes 3(-3) because x=-3, 2y becomes 2(6) because y=6 and z becomes just -4. The whole equation comes to 3(-3)- 2(6)+(-4)= -25