Example 1.1 proposed an experiment in which one group of students prepared for a

Question

Example 1.1 proposed an experiment in which one group of students prepared for an exam by studying text on printed pages and a second group studied the same text on a computer screen. The goal is to determine whether one study technique leads to better exam scores than the other. This same experiment was actually conducted by Ackerman and Ackerman (2011). In one part of the experiment, the students were allowed to control the amount of time that they spent studying. Data similar to the results obtained from this condition are presented in the following table. The data are the test scores obtained from the students in the two conditions Number Correct on a 20-Question Multiple-Choice Exam Text Studied on Printed Pages Text Studied on a Computer Screen 16 17 18 18 19 15 19 14 18 18 18 19 14 17 17 20 15 19 16 17 13 16 14 17 13 18 17 10 17 12 16 15 18 15 19 16 14 12 15 11 13 17

Explanation / Answer

(first part) right choice is third >> The students who studied from printed pages appear to have higher score than those who studied from computer screen

(second part)

(third) right choice is first >>scores for the computer screen group are more variable

(fourth) change of frequency with distance ...........

Printed Computer mean= 17 15 SD= 1.8772 2.4103 Variance= 3.5238 5.8095

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