D which genre has the largest number of movies in

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(d)
Which genre has the largest number of movies in that category?
2.134 Physical Activity by Region of the Country in the US The variables in USStates include the percent of the people in each state who say they have engaged in any physical activity in the last month as well as the region of the
Figure 2.41 Physical activity in US states by region of the country
Which region shows the lowest level of physical activity? Which region shows the highest?
Which region appears to have the biggest range?
Are there any outliers?
Does there appear to be an association between amount of physical activity and region of the country?
Figure 2.44 displays the relationship between vitamin use and the concentration of retinol (a micronutrient) in the blood. Does there seem to be an association between these two variables?
Figure 2.44 Concentration of retinol by vitamin use Vitamin use has little effect on retinol levels Solution The side-by-side boxplots are almost identical. Vitamin use appears to have no effect on the concentration of retinol in the blood. 2.169 Light Roast or Dark Roast for Your Coffee? A somewhat surprising fact about coffee is that the longer it is roasted, the less caffeine it has. Thus an “extra bold” dark roast coffee actually has less caffeine than a light roast coffee. What is the explanatory variable and what is the response variable? Do the two variables have a negative association or a positive association? Exp: roasting time, Resp: amount of caffeine; Negative association Solution The explanatory variable is roasting time and the response variable is the amount of caffeine. The two variables have a negative association.
2.170 Mother's Love, Hippocampus, and Resiliency Multiple studies 58 in both animals and humans show the importance of a mother's love (or the unconditional love of any close person to a child) in a child's brain development. A recent study shows that children with nurturing mothers had a substantially larger area of the brain called the hippocampus than children with less nurturing mothers. This is important because other studies have shown that the size of the hippocampus matters: People with large hippocampus area are more resilient and are more likely to be able to weather the stresses and strains of daily life. These observations come from experiments in animals and observational studies in humans. (a) Is the amount of maternal nurturing one receives as a child positively or negatively associated with hippocampus size? (b) Is hippocampus size positively or negatively associated with resiliency and the ability to weather the stresses of life? (c) How might a randomized experiment be designed to test the effect described in part (a) in

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