1. The WHO recommend that cholesterol levels should be below 200. Cholesterol levels for a group ...

     1. The WHO recommend   that cholesterol levels should be below 200. Cholesterol levels for a group   of individuals were recorded, and are detailed in the following table:      196      . (a) What is the standard error of the   mean cholesterol level?       . (b) Determine (at the 1% level) whether   the average cholesterol level for the patients detailed adheres to the WHO   recommendation. Clearly state any assumptions on which your conclusion   relies. 
      . (c) Construct a 95% confidence interval   for the mean cholesterol level and interpret the resulting interval.