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If the inflation indices was reset to 100 in the the 3rd quarter, what would be the fourth quarter inflation index for food. I have no idea how to do this . Below is the graph:

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This was closer to on-topic on math.stackexchange than it is here. Not every aspect of every statistic is a statistical issue. You need to know the definition of an inflation index from economics, and then it is a simple calculation. Is this a homework question, and has your textbook covered how inflation is calculated? By the way, the word "indices" is the plural of index. – Douglas Zare Sep 7 '12 at 5:39
Those are presumably price indices rather than inflation indices. – Henry Sep 7 '12 at 6:56
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@Henry Could you be so kind to change the title of the question appropriately ? I think I am not qualified, but "Simple Statistics Question" is terrible. – steffen Sep 7 '12 at 8:31
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@DouglasZare Assuming that the unedited spelling was "indexes", then "indexes" actually gets a lot of use in economics literature. Quick browse of English forums on this matter reveals that both are correct. – user13253 Sep 7 '12 at 14:13
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@Shaniqueia: The point I was making was not about how to spell the plural, but not to use it as a singular. Anyway, you can see that the spelling wasn't changed in Henry's edit by clicking on the time of the edit. – Douglas Zare Sep 7 '12 at 23:04
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migrated from math.stackexchange.com Sep 7 '12 at 5:22

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Now, the inflation index is reset to 100% at the 1st quarter. We can see that the 3rd- and 4th-quarter values of Foods are 95% and 94%, respectively.

If the index was reset to 100% at the 3rd quarter, the 4th-quarter index would be $94\% / 95\% \approx 99\%$.

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