SELECT and Arrays

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Hi all -
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Trying to utilize an array within a table, and to SELECT it using the format [x:y]=something, but cant get it to work...
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Here is what I'm currently doing (the dumb way):
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SELECT * FROM students WHERE testscore[1]>70 AND testscore[2]>70;
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Here is what I'd like to do (the less dumb way;) ):
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SELECT * FROM students WHERE testscore[1:2]>'{70,70}';
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--------
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However, PG keeps complaining about not finding an operator for types '_int4' and 'unknown'.
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Anyone have any pointers??
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Thanks,
Barry S