Write the null and alternative hypotheses for the following example. Determine if the example is a case of a two-tailed, a left-tailed, or a right-tailed test.

To test if the mean number of hours spent working per week by college students who hold jobs is different from 20 hours.

a.) H0: μ=20

 hours, H1: μ<20

 hours, two-tailed test

b.) H0: μ=20

 hours, ≠

H1: μ≠20

 hours, right-tailed test

c.) H0: μ=20

 hours, H1: μ<20

 hours, left-tailed test

d.) H0: μ=20

 hours, ≠

H1: μ≠20

 hours, two-tailed test

e.) H0: μ=20

 hours, H1: μ>20

 hours, right-tailed test