A hypothesis test is to be performed. Determine the null and alternate hypotheses.

In

1992

, the average duration of long-distance telephone calls originating in one town was

7.5

minutes. A long-distance telephone company wants to perform a hypothesis test to determine whether the average duration of long-distance phone calls has changed from the

1992

mean of

7.5

minutes.

H0

:

=7.5

minutes

H1

:

7.5

minutes

H0

:

7.5

minutes

H1

:

=7.5

minutes

H0

:

=7.5

minutes

H1

:

>7.5

minutes

H0

:

=7.5

minutes

H1

:

<7.5

minutes