The researcher computed the mean age of her respondents by adding up the scores (the 1s, 2s, and 3s) and then dividing by the number of cases. Which of the following statements is true about this situation?
On a survey, age was divided into three categories:
1. Younger than 18
2. 18 to 21
3. Older than 21
a. A mistake has been made because the scores are only nominal in level of measurement and shouldn't be treated as interval-ratio
b. Since the scores are nominal in level of measurement, the mean is an appropriate measure of central tendency and no mistake has been made
c. Since the scores are interval-ratio in level of measurement, the mean is an appropriate measure of central tendency and no mistake has been made
d. A mistake has been made because the scores are ordinal in level of measurement and shouldn't be treated as interval-ratio
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