Question 1192837
Ho: the mean income is unchanged from the population.
Ha: the mean income is different from the population (more conservative two-way hypothesis).
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Ho: the mean time spent on Netflix has stayed the same or has increased this year.
Ha: the mean time has decreased this year. (this is a one way test, which one might use if there were strong evidence a priori that there might be a negative change).

The main thing is the both hypotheses have to cover all the possibilities, and Ho is either = or >- / <= and Ha is what is left over.