In the pharmaceutical example, why would Medication B be preferred over Medication A, even if both have the same mean improvement?

• Medication B shows a greater overall improvement.

• Medication B is more consistent, with everyone benefiting a good amount.

• Medication A has a wider range of benefits, which is always better.

• Medication A is less expensive to produce.

What do measures of variability describe in statistics?

• How scores in a dataset differ from one another.

• The central tendency of a dataset.

• The relationship between two different datasets.

• The highest and lowest scores in a dataset.

How is the range (r) of a dataset calculated?

• By finding the average of all scores.

• By subtracting the lowest score (l) from the highest score (h).

• By adding the highest and lowest scores together.

• By multiplying the highest score by the lowest score.

What symbol represents the standard deviation of a population?

• s

• Σ

• σ

• μ

What percentage of IQ scores fall between 70 and 130?

• 68%

• 95%

• 99.7%

• 50%