The dentist from Exercises 16.36 and 16.37 has a new question. He wondered if people get most of their cavities when they are young or if they occur consistently over time. To investigate this, he decided to examine the relationship between the ages of his patients and how many of their permanent teeth were decayed, filled, or missing. What test should he use?

Select the appropriate statistical technique from among those in Figure 16.7.

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Selecting a relationship test Level of measurement of the variables One ordinal and one One nominal and one Both interval/ratio Both nominal ordinal/interval/ratio ordinal/interval/ratio Use difference test flowchart. Number of Chi-square test of independence Pearson r Spearman r groups is determined by number of levels of nominal variable