Unexpected symbol error in stats class homework

General
1

So my friend is in a stats class, and his professor keeps giving him faulty code.

He's supposed to type in:

plot(brainwt ~ headsize,
  data = brainhead[brainhead$gender == "male",],
  pch = 1,
  col = "blue",
  main = "Brain Weight versus Head Size by sex”,
  xlab = "head size (cm^3)",
  ylab = "brain weight (grams)"
  xlim = c(2700,5000)
  ylim = c(950,1700)

But he gets this error:

Error: unexpected symbol in:
" main = "Brain Weight versus Head Size by sex”,
xlab = "head"

We've tried messing around with placements of commas, quotations, so on, nothing fixes it. Any help?

2

The closing quote is curly, make it straight.

And though not too relevant here, but still you should be aware of this for future threads:

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