In 2010, the Human and Retirement Study (HRS) conducted a
study on the cognition of non-Hispanic Whites, non-Hispanic Blacks, and
Hispanics. The HRS evaluated the verbal memory of the participants by having them repeat after having
heard a list of 10 words being recited to them.
They were then asked to repeat the words again after spending
5 minutes partaking in a different test.
The study not only assessed participants verbal memory but
also their working memory by asking them to subtract 7 from 100 and from the
next 4 following differences. Attention and working memory were tested together
by participants counting backwards 10 numbers from 20.
The study showed non-Hispanic Whites exhibited higher cognition
in comparison to Hispanics and non-Hispanic Blacks across all age groups.
Hispanics and non-Hispanic Whites showed insignificant difference in cognition
after age, gender, and education were taken into account to avoid confounding
The null hypothesis is that there is no difference between
the performances of White and Hispanic people and the alternative hypothesis is
that Hispanic people answer a greater number correct on the picture test of the
MIT than White people.
Referring to the CMIT database, we obtained a t-value of
1.937 from the data and a t-value of 1.962 for a p-value of 5%. Since the
actual t-value is lower than that of for a p-value of 5%, the alternative
hypothesis is rejected and the null hypothesis is retained.