Exercise 10: Description of a Study Sample
1. What demographic variables were measured at the nominal level of measurement in the Oh
et al. (2014) study? Provide a rationale for your answer.
Bone mineral density (BMD) was a variable measure at the nominal level. The BMD of each
participant was measured then place into one of three groups: normal, osteopenia, and
osteoporosis.
2. What statistics were calculated to describe body mass index (BMI) in this study? Were
these appropriate? Provide a rationale for your answer.
The BMI in this study were described as a mean of 23.8 kg/m2 (SD = 3.2)
The description of BMI does not seem appropriate because of the vast age span of 51-83, as
well as, the variability in height and weight.
3. Were the distributions of scores for BMI similar for the intervention and control groups?
Provide a rationale for your answer.
Yes, the SD for the intervention group was 3.14 and the SD for the control group was
3.32
4. Was there a significant difference in BMI between the intervention and control groups?
Provide a rationale for your answer.
No. The difference in BMI between the intervention and control groups was 0.79.
1. What demographic variables were measured at the nominal level of measurement in the Oh
et al. (2014) study? Provide a rationale for your answer.
Bone mineral density (BMD) was a variable measure at the nominal level. The BMD of each
participant was measured then place into one of three groups: normal, osteopenia, and
osteoporosis.
2. What statistics were calculated to describe body mass index (BMI) in this study? Were
these appropriate? Provide a rationale for your answer.
The BMI in this study were described as a mean of 23.8 kg/m2 (SD = 3.2)
The description of BMI does not seem appropriate because of the vast age span of 51-83, as
well as, the variability in height and weight.
3. Were the distributions of scores for BMI similar for the intervention and control groups?
Provide a rationale for your answer.
Yes, the SD for the intervention group was 3.14 and the SD for the control group was
3.32
4. Was there a significant difference in BMI between the intervention and control groups?
Provide a rationale for your answer.
No. The difference in BMI between the intervention and control groups was 0.79.
