A market research firm conducted an experiment in an attempt to determine what types of food and drink
advertisements on television best hold the attention of children. They observed 15 children:
-Five during the showing of an advertisement featuring breakfast cereal
-Five during the showing of an advertisement featuring a kiddie's meal at a fast-food outlet
-Five during the showing of an advertisement featuring a well-known fizzy drink
All three advertisements were exactly 90 seconds long. The following table gives the duration of time in
seconds that children paid attention to the advertisement viewed:
Advertisement Duration of attention
37
60
68
Cereal
Kiddie's meal
Fizzy drink
75
68
45
83
45
60
68
38
75
75
67
52
Does the experiment provide sufficient evidence to indicate a difference in the average duration
of attention children pay to the three types of advertisements? Use the 5% significance level to
perform the appropriate hypothesis test.
