What can explain variation in effective corporate tax rates?

Word document included the information of the assignment please read carefully, the project plan ppt file is the
topic I am using and the excel file consists the data I am using.
Please clean up the data of the ETR and market capital before analysing.
For better visualization, you maybe using more than 6 sildes as the ppt should include many graphs to interpret
the result. However, the word count of the speech should be around 1500 words.

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