IV.12. Smoking in the United States. Does the survey of Exercise IV.10 provide good evidence that fewer than one-fourth of all American adults smoked in the week prior to the survey?

  1. (a) State the hypotheses to be tested.

  2. (b) If your null hypothesis is true, what is the sampling distribution of the sample proportion ? Sketch this distribution.

  3. (c) Mark the actual value of on the curve. In your opinion, does it appear surprising enough to give good evidence against the null hypothesis?