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Mortgage rates are down slightly today, but 30-year mortgage rates are still up around 45 basis points from where they started the week. 

Rates have been fairly volatile in recent weeks. Investors are closely watching the latest economic data to determine whether another hike from the Federal Reserve is likely to come at its meeting in September.

When the data shows that the economy is still running hot, mortgage rates tend to go up. But the latest piece of major economic data, July's jobs report, may allow rates to fall a bit.