Question: Refer to Exercise, which described a Gallup poll. The poll surveyed a random sample of 439 American teenagers, and one question that they were asked was, "How strict are your parents compared to most of your friends' parents?" The choices were "more strict," "less strict," and "about the same." The choice "less strict" was selected by 30% of the respondents (Mazzuca, 2004).

a. What is the sample proportion that answered "less strict?" Use appropriate notation.

b. Calculate the standard error of the sample proportion.

c. Calculate a 95% confidence interval for the population proportion. Interpret the interval in a way that could be understood by a statistically naïve reader.

Exercise: A Gallup poll surveyed a random sample of 439 American teenagers. One question that they were asked was, "How strict are your parents compared to most of your friends' parents?" The choices were "more strict," "less strict," and "about the same." The choice "more strict" was selected by 171 of the respondents (Mazzuca, 2004).

a. What is the research question of interest?

b. What is the population parameter of interest?

c. What percentage of the sample responded with "more strict"?

d. Draw a figure like Figure to illustrate this situation.