We want to know if costumes have any effect on how much candy a child gets when

Question

We want to know if costumes have any effect on how much candy a child gets when trick-or-treating. We select a street with 9 houses and hire a child actor to play the role of the trick-or-treater. The child vists each house wearing the cute costume and then goes back later wearing the scary costume. The child's face was covered and (according to a later questionnaire) none of the people realized they were giving candy to the same child twice.

We recorded the pieces of candy the child got at each house wearing each costume. You can see the results on the worksheet 'Candy'. What type of test would we use to analyze our results? (dependent samples t test, independet samples t test, z test, one sample t test)

Explanation / Answer

It is a dependent samples t test as the dependent sample t-test, is a statistical procedure used to determine whether the mean difference between two sets of observations is zero.

The dependent t-test compares the means of two related groups to determine whether there is a statistically significant difference between these means.

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