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5 Written questions
5 Multiple choice questions
 is an alternative to a census, in which data is collected from only some members of the population.
 is one of the contributing factors to sampling error. It is the result of choosing a bad sample. Good methods of sample selection minimize sample bias.
 for a data set is the difference between the third quartile and the
first quartile: Q3 Q1.  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.  Maxmin
5 True/False questions

capturerecapture → N=n1*n2/k

mean → 25/100 * N

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. 
random sampling → is a sampling technique in which every member of the population should have the same (random) chance of being in the sample as any other member of the
population. 
doubleblind study → is one of the contributing factors to sampling error. It is the result of choosing a bad sample. Good methods of sample selection minimize sample bias.