EXAMPLE 7.3 One-sided Test for Average Time Using a Smartphone

CASE 7.1 To test whether the average amount of time using a smartphone is less than the UK average our hypotheses are

The test statistic does not change: . As Figure 7.4 illustrates, however, the -value is now , half of the value in Example 7.2. From Table D, we can determine that ; software gives the exact value as . Again, there is not enough evidence to reject the null hypothesis in favor of the alternative at the 0.05 significance level.