2. (3 points for each part) One of the measures used in studying health and obesity is the Body Mass...
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2. (3 points for each part) One of the measures used in studying health and obesity is the Body Mass Index (BMI). A BMI measure between 20 and 25 is considered healthy; a measure of over 30 makes a person obese. The average BMI in the United States rose from 25 to about 27.75 in the last 25 years. This is considered a large increase, and many social scientists have been trying to explain this trend. The results below come from a regression estimated using a national cross section sample of adults. The dependent variable was BMI, and the sample size was over 42000.
Independent Variable | Sample Mean of Variable (Standard Deviation) | Coefficient in Regression (Standard Error) |
Restaurants per capita in respondent’s state | 11.04 (2.27) | .473 (.324) |
Age in years | 41.24 (16.68) | .326 (.016) |
Age squared | -- | -.003 (.0002) |
Cigarette tax per pack in cents in respondent’s state | 22.58 (9.77) | .058 (.032) |
Cigarette tax squared | -- | -.001 (.0004) |
Household income in 10,000s of dollars | 2.91 (2.39) | -.393 (.168) |
a. According to this regression, at about what age does BMI reach its highest level in American adults, other things equal?
12 years ago
999999.99
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