When showing a possessive form of a singular noun, it is proper to use an apostrophe before the "s".
Michael's car (not Michaels car, or Michaels' car)
a hard day's work
the basket's handle
NEVER, NEVER, NEVER, UNDER PENALTY OF DEATH, SHOULD YOU USE AN APOSTROPHE TO SHOW THE PLURAL OF A NOUN. Such as here:
Whenever I see mistakes like the ones above, I die a little inside. Now, go forth and use apostrophes appropriately! You're welcome.