Example#1; A researcher wishes to examine whether timeof day (morning versusafternoon) affects the memory of older and younger participants. He obtains a sample of 40 older individuals and 40 younger individuals and gives them a passage to read. They are later given a test over the passage (scores on the test could range from O to 30). HaJfofthe individuals are randomly assigned to read the passage and take the test in the morning, and the other half do so in the afternoon. The data are reported in the table below (the numbers represent mean test scores for each group; that is, “M" is mean). Morning Testing М-15 Afternoon Testing M=8 М-20 Older Adults Younger Adults M= 16 6. Does there appear to be a main effect of age? 7. Does there appear to be an interaction between age and time of day? (Hint: Draw a line graph)

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Example#1:A researcher wishes to examine whether time of day (morning versus afternoon)
affects the memory of older and younger participants. He obtains a sample of 40 older individuals
and 40 younger individuals and gives them a passage to read. They are later given a test over the
passage (scores on the test could range from O to 30). HaJfofthe individuals are randomly
assigned to read the passage and take the test in the morning, and the other half do so in the
afternoon. The data are reported in the table below (the numbers represent mean test scores for
each group; that is, “M" is mean).
Afternoon Testing
M=8
М-20
Morning Testing
Older Adults
M= 15
Younger Adults
M= 16
6. Does there appear to be a main effect of age?
7. Does there appear to be an interaction between age and time of day? (Hint: Draw a line
graph)
8. Describe in words the pattern of results depicted in these data (you do not need to include
any statistics).
Transcribed Image Text:Example#1:A researcher wishes to examine whether time of day (morning versus afternoon) affects the memory of older and younger participants. He obtains a sample of 40 older individuals and 40 younger individuals and gives them a passage to read. They are later given a test over the passage (scores on the test could range from O to 30). HaJfofthe individuals are randomly assigned to read the passage and take the test in the morning, and the other half do so in the afternoon. The data are reported in the table below (the numbers represent mean test scores for each group; that is, “M" is mean). Afternoon Testing M=8 М-20 Morning Testing Older Adults M= 15 Younger Adults M= 16 6. Does there appear to be a main effect of age? 7. Does there appear to be an interaction between age and time of day? (Hint: Draw a line graph) 8. Describe in words the pattern of results depicted in these data (you do not need to include any statistics).
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