In: Statistics and Probability
The National Institutes of Health (NIH) is studying the air quality index of Washington DC. They are testing If the NIH wishes to test a two-sided alternative, write out their H1
Answer:
Given that,
The National Institutes of Health (NIH) is studying the air quality
index of Washington DC.
They are testing If the NIH wishes to test a two-sided
alternative,
Write out their 
:
For the two-sided alternative,
The alternative must be "not equal 
" type.
Then,
If, 
 then, 
Which is two-sided alternative.