which of the following characteristics of experiments are not also
characteristics of surveys?
check all that apply.
d
a. two or more treatments are compared in the study (possibly
including "no treatment").
o
b. data are gathered during the course of the study.
c. replication with other groups of subjects can improve the
reliability of the study.
o
d. one or more treatment groups and a control group are included in
the study
o
e. the results of the study are analyzed statistically.

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain