In a study comparing banks in two countries, a sample of 148 matched pairs of banks was formed. Each pair contained one

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In a study comparing banks in two countries, a sample of 148
matched pairs of banks was formed. Each pair contained one bank
from the Netherlands and one from Croatia. The pairings were made
in such a way that the two members were as similar as possible in
regard to such factors as size and age. The ratio of total loans
outstanding to total assets was calculated for each of the banks.
For this ratio, the sample mean difference (The
Netherlands–Croatia) was 0.0504, and the sample standard deviation
of the differences was 0.3053. Test, against a two-sided
alternative, the null hypothesis that the two population means are
equal.