FIGURE 7-
Making a Decision
To decide whether to reject the null hypothesis, we compare the test statistic to the critical values. In this instance, the z score of –2.36 is beyond the critical value of –1.96, so we reject the null hypothesis. Customers at those Starbucks with calories posted on the menu consume fewer calories, on average, than do customers at those Starbucks without posted calories.
Making a Decision
To decide whether to reject the null hypothesis, we compare the test statistic to the critical values. In this instance, the z score of –2.36 is beyond the critical value of –1.96, so we reject the null hypothesis. Customers at those Starbucks with calories posted on the menu consume fewer calories, on average, than do customers at those Starbucks without posted calories.