Practice question #1 Descriptions are given of three studies involving dog owners. Indicate whether the two samples described in each part are “paired” or “independent”. In a study about whether playing with a dog raises levels of a hormone called oxytocin (which plays a role in social bonding), oxytocin levels of 22 dog owners were recorded before and after playing with their dog for 30- minutes. A random sample of 20 dog-owners and a random sample of 20 people who did not own pets were both scored on their levels of stress. A group of 20 dog-owners were selected and were scored on their levels of stress. Researchers also recorded the household income of each dog- owner; for each dog-owner, another person who does not own a dog but has a similar income level is identified and included in the sample of 20 non-dog-owners.
Practice question #1
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Descriptions are given of three studies involving dog owners. Indicate whether the two samples described in each part are “paired” or “independent”.
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In a study about whether playing with a dog raises levels of a hormone called oxytocin (which plays a role in social bonding), oxytocin levels of 22 dog owners were recorded before and after playing with their dog for 30- minutes.
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A random sample of 20 dog-owners and a random sample of 20 people who did not own pets were both scored on their levels of stress.
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A group of 20 dog-owners were selected and were scored on their levels
of stress. Researchers also recorded the household income of each dog-
owner; for each dog-owner, another person who does not own a dog but
has a similar income level is identified and included in the sample of 20 non-dog-owners.
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