Age (months) when children with heart disease start to talk
Do the cyanotic children speak their first word later on average?
The two examples show how the paired t-test is conducted using the differences, d.
Age when children with heart disease start to talk
Blood pressure and the pill
Age when children with heart disease start to talk
A research worker studying congenital heart disease wishes to compare the development of cyanotic children with normal children. Among the measurement of interest is the age at which the children speak their first word.
Rather than independently selecting a sample of cyanotic and a sample of normal children for this comparison, the researcher chooses cyanotic children who have a sibling of the same gender. Measurements from the children therefore form a paired data set. The ages in months when the first word was spoken are shown below.
Pair of siblings |
Cyanotic sibling |
Normal sibling |
Difference (cyanotic - normal) |
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Blood pressure and the pill
Does the pill affect blood pressure? The blood pressures of 15 college-aged women were recorded before they started the pill and after using it for 6 months.