The figure to the right shows the estimated average life expectancy (in years) f

Question

The figure to the right shows the estimated average life expectancy (in years) for a sample of 40 countries against the average amount of fat (measured in grams per capita per day) in the food supply for each country. The scatterplot shows a clear positive association (r 0.70) between these two variables The countries with below-average fat consumption all have short life expectancies, while the countries consuming more than 100 grams of fat on average all have life expectancies over 70 years. Does this mean that we should eat more fat in order to live longer? Explain. s0 10 30 S 13050 ) In 1912, the RMS Titanie, a British passenger ship. Totals sank in the North Atlantic Ocean after colliding with an iceberg. Historians do not know the exact passenger list, so the death toll is estimated. Here is data from the 2201 passengers on board, by cabin class. Class Class Class 2201 Of interest is the question of whether class (1t or 3) plagyed a roll in a passenger's lkelihood of surviving, Which proportions are most useful in analyzing the relationship between passenger class and surviving the Titanie? (a) 122/325 and 203/325 (b) 203/325 and 528/706 (c) 203/325 and 178/706 (d) 203/711 and 178/711 The ASSC wants to conduct a study board members is n statistics studentand suggests that a stratified sample might prodace more misbemuhsha simple random sample (SRS). Suggrst an efictive variable upon which to stratify and explain whoy this would be to estimate the average ansual coots of textbooks for Skylise studeats One of the preferable to SRS.

Explanation / Answer

8) the scatter plot and the coefficient of correlation r=0.70, shows a clear positive association between the two variables. But before concluding that we should eat more fat to live longer, we should check the residual plot in order to validate our results ( model).

Using residual plots, you can assess whether the observed error (residuals) is consistent with stochastic(means random and unpredictable) error.

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