
Hypothesis test
Hey I'm learning about Hypothesis test this week and the way my teacher explained it was very confusing. So I was wondering if i post a question and the answer I get could someone tell me if I did it right or not. Thank You.
For this problem I need to write its complement and which is Ho and Ha. the problem is u<128
I got Ha= u<128 and Ho= u > 128.
For this problem I need to determine wither the hypothesis test is tailed to the left, right or both. the problem isThe mean life of a certain tire is no less than 50,000 miles.
My answer is u > 50,000 and is tailed to the left.
The problem for this one is A taxicab comp. claims that the mean travel time between 2 destinations is about 21 min. You work for a bus comp. and you reject this claim. How would you write the null and alternative hypthesis?
My answer is Ho= u> 21 min. and Ha= u>21 min
Thank you to whom responds I'm not sure if I'm doing this write.

Angel (Best Solution)
(i) H0: u>=128
H1: u<128
this is left tail test.
(ii) H0: u>=50,000
H1: u<50,000
this is also left tail test.
(iii) H0:u<=21
H1:u>21
this is right tail test.