{"id":319,"date":"2022-06-17T15:25:06","date_gmt":"2022-06-17T15:25:06","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/alphamodule\/?post_type=chapter&p=319"},"modified":"2022-06-17T15:31:05","modified_gmt":"2022-06-17T15:31:05","slug":"advanced-experimental-design-apply-it-2","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/alphamodule\/chapter\/advanced-experimental-design-apply-it-2\/","title":{"raw":"Advanced Experimental Design: Apply It 2","rendered":"Advanced Experimental Design: Apply It 2"},"content":{"raw":"Work in small groups to answer Questions 3 - 6.\r\n
\r\n

question 3<\/h3>\r\nA school psychologist wants to test the effectiveness of a new method for teaching reading. She recruits 80 first-grade students in District Code 75104 and randomly divides them into two groups. Group 1 is taught by means of the new method, while Group 2 is taught by the traditional method. The same teacher is assigned to teach both groups. At the end of the year, an achievement test is administered and the results are compared.\r\n\r\n \r\n\r\nPart A: What is the factor of interest? What is the response variable?\r\n\r\n[reveal-answer q=\"151292\"]Hint[\/reveal-answer]\r\n[hidden-answer a=\"151292\"]What do you<\/em> think? What is it that gets manipulated and what is compared at the end?[\/hidden-answer]\r\n\r\n \r\n\r\nPart B: What are some factors, other than the factor of interest, in the study that could affect test scores? How are they controlled?\r\n\r\n[reveal-answer q=\"250468\"]Hint[\/reveal-answer]\r\n[hidden-answer a=\"250468\"]What other factors are given in the scenario? Are the students limited to a particular grade level or a single teacher, for example? [\/hidden-answer]\r\n\r\n \r\n\r\nPart C: What are the treatment groups?\r\n\r\n[reveal-answer q=\"336699\"]Hint[\/reveal-answer]\r\n[hidden-answer a=\"336699\"]Include the treatment of interest as well as the control.[\/hidden-answer]\r\n\r\n \r\n\r\nPart D: What are the experimental units (or subjects)?\r\n\r\n[reveal-answer q=\"151841\"]Hint[\/reveal-answer]\r\n[hidden-answer a=\"151841\"]In this case, who is receiving the treatments?[\/hidden-answer]\r\n\r\n \r\n\r\nPart E: Are there any factors that cannot be controlled that might affect the test results? How can we minimize the effect that this variable may have on the outcome?\r\n\r\n[reveal-answer q=\"686487\"]Hint[\/reveal-answer]\r\n[hidden-answer a=\"686487\"]What do you<\/em> think?[\/hidden-answer]\r\n\r\n \r\n\r\nPart F: Previous research indicates that girls and boys may react differently to the two methods of instruction (there are an even number of girls and boys).\u00a0 How can you design an experiment that will control the effects due to gender on the scores on the achievement test (the response factor)? Complete the following template to illustrate your design.\"A\r\n\r\n[reveal-answer q=\"263107\"]Hint[\/reveal-answer]\r\n[hidden-answer a=\"263107\"]Remember, blocks are made of homogenous groups whose members are then randomly assigned to treatments. At the end, the response variable (achievement test results in this case) are compared within each block and across blocks. [\/hidden-answer]\r\n\r\n<\/div>\r\n
\r\n

Guidance<\/h3>\r\n[Sub-summary: How are you doing so far? Are you starting to develop a mental landscape for completely randomized block design? If so, try answering these questions in your notes:<\/span>\r\n
    \r\n \t
  • First, recall the key components of good experimental design.\r\n[reveal-answer q=\"607207\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"607207\"]Factor of interest, response factor, nuisance factors, treatments, and random assignment.[\/hidden-answer]<\/li>\r\n \t
  • What are the basic principles of the completely randomized block design?<\/span>\r\n[reveal-answer q=\"934614\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"934614\"]Blocking and randomization[\/hidden-answer]<\/li>\r\n \t
  • What role does each principle play in the design?<\/span>\r\n[reveal-answer q=\"450675\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"450675\"]Blocking aids in minimizing the effects of nuisance factors. Randomization is used to assign subjects within the blocks to the treatment groups to help ensure that the groups have similar distributions of factors other than the factor of interest.[\/hidden-answer]<\/li>\r\n<\/ul>\r\n<\/div>\r\n ","rendered":"

    Work in small groups to answer Questions 3 – 6.<\/p>\n

    \n

    question 3<\/h3>\n

    A school psychologist wants to test the effectiveness of a new method for teaching reading. She recruits 80 first-grade students in District Code 75104 and randomly divides them into two groups. Group 1 is taught by means of the new method, while Group 2 is taught by the traditional method. The same teacher is assigned to teach both groups. At the end of the year, an achievement test is administered and the results are compared.<\/p>\n

     <\/p>\n

    Part A: What is the factor of interest? What is the response variable?<\/p>\n

    Hint<\/span><\/p>\n
    What do you<\/em> think? What is it that gets manipulated and what is compared at the end?<\/div>\n<\/div>\n

     <\/p>\n

    Part B: What are some factors, other than the factor of interest, in the study that could affect test scores? How are they controlled?<\/p>\n

    Hint<\/span><\/p>\n
    What other factors are given in the scenario? Are the students limited to a particular grade level or a single teacher, for example? <\/div>\n<\/div>\n

     <\/p>\n

    Part C: What are the treatment groups?<\/p>\n

    Hint<\/span><\/p>\n
    Include the treatment of interest as well as the control.<\/div>\n<\/div>\n

     <\/p>\n

    Part D: What are the experimental units (or subjects)?<\/p>\n

    Hint<\/span><\/p>\n
    In this case, who is receiving the treatments?<\/div>\n<\/div>\n

     <\/p>\n

    Part E: Are there any factors that cannot be controlled that might affect the test results? How can we minimize the effect that this variable may have on the outcome?<\/p>\n

    Hint<\/span><\/p>\n
    What do you<\/em> think?<\/div>\n<\/div>\n

     <\/p>\n

    Part F: Previous research indicates that girls and boys may react differently to the two methods of instruction (there are an even number of girls and boys).\u00a0 How can you design an experiment that will control the effects due to gender on the scores on the achievement test (the response factor)? Complete the following template to illustrate your design.\"A<\/p>\n

    Hint<\/span><\/p>\n
    Remember, blocks are made of homogenous groups whose members are then randomly assigned to treatments. At the end, the response variable (achievement test results in this case) are compared within each block and across blocks. <\/div>\n<\/div>\n<\/div>\n
    \n

    Guidance<\/h3>\n

    [Sub-summary: How are you doing so far? Are you starting to develop a mental landscape for completely randomized block design? If so, try answering these questions in your notes:<\/span><\/p>\n

      \n
    • First, recall the key components of good experimental design.\n
      Show Answer<\/span><\/p>\n
      Factor of interest, response factor, nuisance factors, treatments, and random assignment.<\/div>\n<\/div>\n<\/li>\n
    • What are the basic principles of the completely randomized block design?<\/span>\n
      Show Answer<\/span><\/p>\n
      Blocking and randomization<\/div>\n<\/div>\n<\/li>\n
    • What role does each principle play in the design?<\/span>\n
      Show Answer<\/span><\/p>\n
      Blocking aids in minimizing the effects of nuisance factors. Randomization is used to assign subjects within the blocks to the treatment groups to help ensure that the groups have similar distributions of factors other than the factor of interest.<\/div>\n<\/div>\n<\/li>\n<\/ul>\n<\/div>\n

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