n supplementary reading. He decides to do an experiment to evaluate the three options. He solicits 27 volunteers from his class and randomly assigns 9 to ea
A college professor wants to determine the best way to present an important topic to his class. He has the following three choices: (1) he can lecture, (2) he can lecture and assign supplementary reading, or (3) he can show a film and assign supplementary reading. He decides to do an experiment to evaluate the three options. He solicits 27 volunteers from his class and randomly assigns 9 to each of three conditions. In condition 1, he lectures to the students. In condition 2, he lectures and assigns supplementary reading. In condition 3, the students see a film on the topic and receive the same supplementary reading as the students in condition 2. The students are subsequently tested on the material. The following scores (%) were obtained:
Table 2: Ways of Presenting a Topic in the Class
|
Condition 1 Lecture |
Condition 2 Lecture + Reading |
Condition 3 Film + Reading |
|
92 |
86 |
81 |
|
86 |
93 |
80 |
|
87 |
97 |
72 |
|
76 |
81 |
82 |
|
80 |
94 |
83 |
|
87 |
89 |
89 |
|
92 |
98 |
76 |
|
83 |
90 |
88 |
|
84 |
91 |
83 |
a) What is the null and alternative hypothesis?
b) What is the conclusion? Use α = 0.05.
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