chapter 11 Research Design A researcher wants to test the effectiveness of two d
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Question
chapter 11 Research Design
A researcher wants to test the effectiveness of two different computer-based instructional methods on teaching a unit on weather in seventh-grade science. The researcher finds a teacher who will permit three of his classes to participate: Two classes use the computer-based instruction, and the third receives conventional classroom instruction. The researcher administers a pretest to all students, each class has a different method of instruction, and then a post test is administered.
a. Specify the design of this study and represent it using the notation system used in this chapter.
b. What statistics would you choose to analyze these data?
The book link https://books.google.com/books?id=WSQLAAAAQBAJ&pg=PA353&lpg=PA353&dq=Research+Design+A+researcher+wants+to+test+the+effectiveness+of+two+different+computer-based+instructional+methods+on+teaching+a+unit+on+weather+in+seventh-grade+science.+The+researcher+finds+a+teacher+who+will+permit+three+of+his+classes+to+participate:+Two+classes+use+the+computer-based+instruction,+and+the+third+receives+conventional+classroom+instruction.+The+researcher+administers+a+pretest+to+all+students,+each+class+has+a+different+method+of+instruction,+and+then+a+post+test+is+administered.+a.+Specify+the+design+of+this+study+and+represent+it+using+the+notation+system+used+in+this+chapter.+b.+What+statistics+would+you+choose+to+analyze+these+data?+Comment&source=bl&ots=MrJlC5X-Ut&sig=YxGpEEi03OfZ3pIN_uW1JADDn2s&hl=ar&sa=X&ved=0ahUKEwjeo4CW_9fLAhWHVyYKHUKlCX4Q6AEIHTAA#v=onepage&q=Research%20Design%20A%20researcher%20wants%20to%20test%20the%20effectiveness%20of%20two%20different%20computer-based%20instructional%20methods%20on%20teaching%20a%20unit%20on%20weather%20in%20seventh-grade%20science.%20The%20researcher%20finds%20a%20teacher%20who%20will%20permit%20three%20of%20his%20classes%20to%20participate%3A%20Two%20classes%20use%20the%20computer-based%20instruction%2C%20and%20the%20third%20receives%20conventional%20classroom%20instruction.%20The%20researcher%20administers%20a%20pretest%20to%20all%20students%2C%20each%20class%20has%20a%20different%20method%20of%20instruction%2C%20and%20then%20a%20post%20test%20is%20administered.%20a.%20Specify%20the%20design%20of%20this%20study%20and%20represent%20it%20using%20the%20notation%20system%20used%20in%20this%20chapter.%20b.%20What%20statistics%20would%20you%20choose%20to%20analyze%20these%20data%3F%20Comment&f=false
Explanation / Answer
a) The study follows convinient sampling, where 3 classes or samples were chosen conviniently and test is performed.
b) It is assumed that the experiment follows Independent group assumption (2 classes us ecomputer instruction and 1 class use conventional), Independence assumption:data in each group is collected through randomization and both the groups follow Nearly Normal condition. The suitable test statistic is 2-sample t test to comapre mean scores after the post test.
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