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

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 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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