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Typing errors in a text are either nonword errors (as when the is typed as teh)

ID: 3149545 • Letter: T

Question

Typing errors in a text are either nonword errors (as when the is typed as teh) or word errors that result in a real but incorrect word. Spell-checking software will catch nonword errors but not word errors. Human proofreaders catch 70% of word errors. You ask a fellow student to proofread an essay in which you have deliberately made 10 word errors.

If the student matches the usual 70% rate, what is the distribution of the number of errors caught?

a. Binomial, with n = 10 and p = 0.3. b. Not a binomial distribution. c. Binomial, with n = 10 and p = 0.7. d.Binomial, with n = 10 and p = 70.

Explanation / Answer

c) Binomial with n=10,p=0.7