1.34 Multitaskers, Part II. Researchers investigating the effect of studying whi
ID: 3073759 • Letter: 1
Question
1.34 Multitaskers, Part II. Researchers investigating the effect of studying while watching TV on school performance conducted the following studies. For each study determine (i) the type of study (observational or experiment), (ii) if there is random sampling, (i) if there is random assignment, (iv) state the scope of the conclusions of the study, and (v) note if stratifying, blocking, or neither of these techniques were used in the study. (a) Researchers randomly sampled 50 female and 50 male high school students. Half of the females and half of the males were randomly assigned to study in a room with a TV and the remainder studied without a TV. They found that the mean grade point average of both males and females who did not watch TV while studying was significantly higher than those who did watch TV while studying. (b) Researchers surveyed the first 100 students who showed up to prom. They found that the mean grade point average of students who did not watch TV while studying was higher than the mean grade point average for students who did watch TV while studying. (c) Researchers surveyed the first 50 male and 50 female students who showed up to prom. They found that the mean grade point average of both males and females who did not watch TV while doing homework was higher than the mean grade point average of students who did watch TV while studying.Explanation / Answer
1.34 a) (i) The mentioned study is a observational study as the researchers observed the high school students.
(ii) There is random sampling in the study as the researchers randomly choose 50 males and 50 females.
(iii) There is random assignment as the researchers randomly assigned half of the females and half of the males to study in a room with a TV and the remainder studied without a TV.
(iv) The researchers found that the mean grade point average of both males and females who did not watch TV while studying was significantly higher than those who did watch TV while studying.
(v) Blocking was used in the study.
1.34 b) (i) The mentioned study is a observational study as the researchers observed the high school students.
(ii) There is no random sampling as the researchers surveyed only the first 100 students who showed up in the prom.
(iii) There is no random assignment.
(iv) The researchers found that the mean grade point average of students who did not watch TV while studying was significantly higher than those who did watch TV while studying.
(v) Blocking was used in the study.
1.34 c) (i) The mentioned study is a observational study as the researchers observed the high school students.
(ii) There is no random sampling as the researchers surveyed the first 50 females and first 50 male students who showed up in the prom.
(iii) There is no random assignment.
(iv) The researchers found that the mean grade point average of both males and females who did not watch TV while studying was significantly higher than those who did watch TV while studying.
(v) Blocking was used in the study.
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