5 Written questions
5 Multiple choice questions
 is a sampling method which uses random or probabilistic selection as part of its design.
 75/100 * N
 for a data set is the difference between the third quartile and the
first quartile: Q3 Q1.  N=n1*n2/k
 is a controlled placebo study in which neither the subjects nor the scientists conducting the study know which subjects are in the treatment group and which are in the control group.
5 True/False questions

mean → of a quantitative data set is a summary of the center of the data set.
It is computed by adding the data elements together and dividing by N, the number of
data elements. 
confounding variable → is a variable which represents a measurable quantity,
one which can be represented by a number. 
survey → is an alternative to a census, in which data is collected from only some members of the population.

quantitative variable → is a possible contributing cause in a clinical study or trial that
could produce the same effect as the variable under investigation. A good clinical study or trial attempts to eliminate confounding variables using a control group. 
fivenumber summary → for a data set consists of the minimum value in the data set
Min, the first quartile Q1, the median M = Q2, the third quartile Q3, and the maximum value Max.