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5 Written questions
5 Multiple choice questions
 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.
 N=n1*n2/k
 is an alternative to a census, in which data is collected from only some members of the population.
 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.  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.
5 True/False questions

Q1 → 25/100 * N

range → 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. 
Q3 → 75/100 * N

simple 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 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.