I was going to say categorically that #1 is correct and #2 is wrong. "Every" requires a singular noun. "stratum" is singular; "strata" is plural.
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Mr WordyWould anyone else like to comment on this?I studied Latin for three years at school plus a few months at Helsinki University and I certainly would not use the plural with every. However, I'm one of those who also say these data are and the media are, so I'm not sure if my opinion really counts...
Cool BreezeHowever, I'm one of those who also say these data are and the media are,