4.31 Appraising a poll. Exercise 4.22 gives part of the description of a sample survey from The New York Times. It appears that the sample was taken in several stages. Why can we say this? The first stage no doubt used a stratified sample, though the Times does not say this. Explain why it would be bad practice to use an SRS from all possible telephone numbers rather than a stratified sample of landline-only, cell-phone-only, and dual-phone users.