I need a statistician - Project Help

Job ID: 33914223

Budget: $25 – $50 USD

Testing two population groups:
Index Returns from Country A (RETURNS IN APRIL) - Statistically significant @ 1% t-test
Index Returns from Country B (RETURNS IN APRIL) - Statistically significant @ 5% t-test

(Null hypothesis that mean is equal to 0).
(See pictures)
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Research question for my project is Are there mutual statistically significant stock market anomalies between Index A and Index B?
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How can I go about answering my research question?
If I take the returns from Country A and Country B, subtract returns on the same day to get a difference between the two and do another t-test to see if the mean is equal to 0 does it mean that they are mutually statistically significant?

I need help advice on how I can do a test to fulfill the research question