In 2010, Musa got 750 bags of coffee from his farm. In 2011 his yield dropped by 30%
due to drought and in 2012 his yield rose by 15% over that of 2011. A bag of coffee weighs 55kg
and Musa was paid sh. 7900 per tone in 2010. Thereafter the price per tone increased each
year by 10%. Find his earning from coffee for each of the three years. Hence, find his total
income from coffee for three years.

In a study of the relationship between socio-economic class and unethical behavior, 129 university of california undergraduates at berkeley were asked to identify themselves as having low or high social-class by comparing themselves to others with the most (least) money, most (least) education, and most (least) respected jobs. they were also presented with a jar of individually wrapped candies and informed that the candies were for children in a nearby laboratory, but that they could take some if they wanted. after completing some unrelated tasks, participants reported the number of candies they had taken. it was found that those who were identiď¬ed as upper-class took more candy than others. in this study, identify: (a) the cases, (b) the variables and their types, (c) the main research question, (d) identify the population of interest and the sample in this study, and (e) comment on whether or not the results of the study can be generalized to the population, and if the ď¬ndings of the study can be used to establish causal relationships.