Question: (No analysis is needed. Based on Parker et.al., AJPH April 2007). A study examining physical activity and the development of hypertension in young adults reported mean exercise scores for white and black women. Exercise scores were calculated based on the frequency and intensity of 13 sports and exercise activities over the past 12 months, with higher values indicating more exercise. The mean + sd exercise score for black women was 279.2 + 230.7, while the mean score for white women was 405.4 + 261.3. The difference in these means is -126.2 (279.2 – 405.4 = -126.2), and the 95% confidence interval for this difference in means is (-146.8 , -105.6) (we did not cover the calculations for this confidence interval i n class, and you do not have enough information to check the calculation – you can trust that the investigators performed the analysis correctly).

Based on this confidence interval, what can you conclude about the difference in mean exercise levels for black and white women. In particular, a t-test would also be an appropriate analysis to compare mean exercise levels in these two groups (you do not have enough information to perform a t-test here). What can you say about the results of this t-test, based on the confidence interval presented above? Explain.