Does one keyword effect another?

[aschow]

Here is a hypothetical situation:

An ad group has 1000 keywords. Only 10 of them are getting clicks. Do the 990 keywords that are not getting clicks effect the 10 that are?

If so, how and why.

[qwik]

yes.. pulls down the overall account quality score..

[SEMblahblah]

poor performing keywords don't affect the performance of other keywords in the ad group directly but key words with very low quality scores would affect the quality score of the entire account in general..try getting rid of such keywords..would improve the quality of the account!