Question

a researcher is interested to see if having a college degree results in higher incomes. she knows the average income for the general population (in thousands) is μ

Answer 1

If earning more money from a college degree occurs, a researcher is interested in finding out. She is aware that the average annual household income in thousands is  μ<=80.

The null hypothesis is a claim made about the population parameter in relation to the test's goal and in opposition to the alternative hypothesis.

• The term "null hypothesis" refers to a researcher's attempt to reject or "nullify" a commonly held assumption (such as that the sky is blue). A null hypothesis is "a statistical theory suggesting that no statistical relationship exists between given observed variables," according to a more formal definition.                                                 

• It always contains = , ≤ , ≥ signs.
• The results will be examined using a one-tailed hypothesis test.

       Hence, μ<=80

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