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    clairebearsport's Avatar
    clairebearsport Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 7, 2012, 07:08 PM
    A study of cell phones and the risk of brain cancer looked at a group of 469 people w
    The choices are:
    Observational study: prospective
    Observational study: retrospective
    Observational study: cross-sectional
    Experiment: matched pairs design
    Experiment: randomized block design
    Experiment: completely randomized design

    I am very confused in my understanding of the different experiment types. Please help!
    Wondergirl's Avatar
    Wondergirl Posts: 39,354, Reputation: 5431
    Jobs & Parenting Expert
    		  
    #2

    Apr 7, 2012, 07:30 PM
    Read this page and see if it comes clearer --

    Experimental Design
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