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1. When we perform a proper experiment, we can A. establish causation. BJ obtain blased results for the sample statistics G. Produce experimental results that are confounded with the explanatory variable. D. More readily extend the results to the population than with surveys E Implement blocking - something that is NOT possible with surveys, 2. Which one of the following is NOT a principle of proper experimentation? A Randomly allocating experimental units to treatments. "B. Confounding the explanatory variable and response variable, " C Replication to measure overall experimental error and increase precision. D. Use of control group to determine whether treatment really works. 3. Jane, a student at BYU, decides to study opinions of BYU students concerning grading in religion classes. She obtains a roll from every religion class and randomly selects five students on each roll. This is an example of A. Simple random sampling. B. Multistage sampling. "C. Stratified sampling. D. Convenience sample. Refer to the previous question. Even though Jane 4.randomly selects students, her survey is biased because not all students take religion classes every semester. What type of bias is this? A. Undercoverage bias B. Non-response bias CC. Question wording bias D. Interviewer bias 5. Why do we compare different treatment groups in experiments? A. To eliminate bias associated with lurking variables. B. To enhance the placebo effect. C. To enable the measurement of treatment differences. D. To remove extraneous variation from the experiment error. E. To more precisely measure chance variation. 6. What characterizes a probability sample but not a sample of convenience? A.Some type of random device is used to obtain a probability sample. B. Their probabilities can be computed. C.) All possible probability samples can be listed. D. Inferences can appropriately be made from probability samples. E. All of the above