John thinks that whenever he takes the late bus home after school, he is hungrier than when he takes the regular bus home. He decides to record whether or not he goes back for seconds at the dinner table each night and cross reference those data with which bus he took home from school. He found that he had seconds at dinner eight of the nine recorded days in which he took the late bus compared to having seconds at dinner only seven of the 21 times he took the early bus. John turned in a paper to his statistics teacher that stated that the late bus was causing his hunger. When John's paper was returned to him, the professor had written, "Were the days you took the late bus the same days you played after-school sports?" What potential problem is his professor trying to point out?

John thinks that whenever he takes the late bus home after school, he is hungrier than when he takes the regular bus home. He decides to record whether or not he goes back for seconds at the dinner table each night and cross reference those data with which bus he took home from school. He found that he had seconds at dinner eight of the nine recorded days in which he took the late bus compared to having seconds at dinner only seven of the 21 times he took the early bus. John turned in a paper to his statistics teacher that stated that the late bus was causing his hunger. When John's paper was returned to him, the professor had written, "Were the days you took the late bus the same days you played after-school sports?" What potential problem is his professor trying to point out?

Naim 23:55

John thinks that whenever he takes the late bus home after school, he is hungrier than when he takes the regular bus home. He decides to record whether or not he goes back for seconds at the dinner table each night and cross reference those data with which bus he took home from school. He found that he had seconds at dinner eight of the nine recorded days in which he took the late bus compared to having seconds at dinner only seven of the 21 times he took the early bus. John turned in a paper to his statistics teacher that stated that the late bus was causing his hunger. When John's paper was returned to him, the professor had written, "Were the days you took the late bus the same days you played after-school sports?" What potential problem is his professor trying to point out?



A. The possibility of a confounding variable.
B. The low power of a test with a small sample size.
C. The lack of blinding.
D. The unequal sample size.
E. The lack of a control group.






Answer: A


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