Define 'investment'. You mention CD rates, i.e. INCOME, but what is your objective, income or growth/captal gains? What is your time frame? If you're just looking for a place to park your money for a short time to beat CD rates, that's one thing. But, buying equities low and selling high is quite another. Your question as stated is impossible to answer.
As an income investor, I commonly receive 7-15% annual returns paid monthly/quarterly. But, preservation of capital with anticipated growth is also an objective for the longer haul. What is your objective?