Sample mean:

Hypothesized population mean:

Population standard deviation:

Sample size:

(The average customer watches 48 hours or less of a sport channel per month.)

(The average customer watches more than 48 hours of a sport channel per month.)

We use the formula for the z-test of one population mean:

For a significance level , and since this is a right-tailed test (due to ), we find the critical z-value from the z-table as .

Reject the if

Since the calculated z-value of is not greater than the critical z-value of , we do not reject the

Therefore, at the 1% significance level, we do not have sufficient evidence to conclude that the average customer watches more than 48 hours of a sport channel per month.

**This means that the claim by the Advance cable network that the average customer watches 48 hours or less per month stands**.

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