Assistant with stats

Question

In 2002 the (BMI) for adult males in the USA was µ = 27.9 with a Standard Deviation σ = 6.14. but now let’s say you recruit a sample of n = 90 men who follow the diet guidelines for 4 weeks and afterwards their average BMI is  

-X = 26.5   
   

Calculate the new standard error.
 


Calculate the new Z score for your sample mean.
 
 

(using a 2 tailed test) Do you reject the Null hypothesis now? Why or Why not?
 

 
Did the results of your test change? Why?   

%MCEPASTEBIN%

Answer 1

You haven't given the complete question.