In 1990, the average duration of long-distance telephone calls originating in one town was 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 1990 mean of The hypotheses are:

The null hypothesis is

The alternate hypothesis is

Step-by-step explanation:

Mean of X in 1990, test if the mean duration has changed:

At the null hypothesis, we test if the mean duration is still X, that is:

At the alternate hypothesis, we test if the mean duration has the changed, that is, if it is different of X. So

sup

step-by-step explanation:

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step-by-step explanation: