Question

do older adults have a smaller mean hip girth in this sample? which statement is the most accurate description? dotplot with age (years) 40-79 and 0-39, hip girth rounded (75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130) options: older adults have a larger mean hip girth compared to younger adults. older adults have a smaller mean hip girth compared to younger adults. the mean hip girth is about the same for the two groups. it is impossible to tell from the dotplots.

Explanation:

To determine the mean hip girth for each age group (0 - 39 and 40 - 79) from the dotplots, we analyze the center of the data distributions. The dotplot for 0 - 39 (younger adults) has data points spread, but the dotplot for 40 - 79 (older adults) is shifted to the left (lower values) compared to the 0 - 39 group. A left - shifted distribution for older adults means their mean hip girth is smaller, as the mean is influenced by the center of the data. So we compare the two distributions' centers.

Answer:

Older adults have a smaller mean hip girth compared to younger adults.