(3 points) A researcher is interested in studying the effect of iron on human memory so he comes up with the following plan for an experiment. The...
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tried CDE and CD for the second part of the question but my score is 67% for the two attempts

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(3 points) A researcher is interested in studying the effect of iron on human memory so he comes up with the following plan for an experiment. The experiment will involve 100 volunteers where 50 volunteers
are randomly selected from all female volunteers and 50 are randomly selected from all male volunteers. Each volunteer will take a memory test 30 minutes after eating spinach. Some volunteers will be
randomly assigned to eat iron-free spinach; some will eat regular spinach (with iron); others will eat a mixture of the two which contains only half the amount of iron. For each volunteer, a test score (the
number of items recalled correctly) will be recorded. The volunteers will not be told which type of spinach they have been given, but the researcher who evaluates the results will prepare the cans of spinach
right on the spot (out of sight of the volunteers).
Part i) What sampling technique is used to obtain the 100 volunteers to participate in the study?
O A. Systematic sampling
O B. Simple random sampling
O C. Two-stage cluster sampling
D. Stratified random sampling
O E. One-stage cluster sampling
Part ii) Which of the following features is/are present in this study? CHECK ALL THAT APPLY.
O A. Double blinding
OB. Replication
C. Single blinding
D. Blocking
E. Confounding
OF. None of the above
Part iii) The treatments of this study is/are:
O A. iron
O B. no iron, half dose of iron and full dose of iron
O C. a can of spinach
O D. iron-free spinach and regular spinach with iron
Note: You can earn partial credit on this problem.
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