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: ?=20
hours, H1: ?<20
hours, two-tailed test
b.) H0: ?=20
hours, ?
H1: ??20
hours, right-tailed test
c.) H0: ?=20
hours, H1: ?<20
hours, left-tailed test
d.) H0: ?=20
hours, ?
H1: ??20
hours, two-tailed test
e.) H0: ?=20
hours, H1: ?>20
hours, right-tailed test
