4. Find the 95% confidence interval for the mean wedding cost for the Piedmont Triad. How does it compare to the 90% confidence interval (narrower or wider)? Does your conclusion about the Piedmont Triad being different change? 5. Suppose you wanted to keep the confidence level at 90%, but you wanted to decrease the width of the interval. How could you do this? 6. When you conduct your survey, you also ask whether the couple had a destination wedding. Seven out of the 40 couples reported having a destination wedding. Find the 80% confidence interval for the proportion of couples that have a destination wedding. a. What is the point estimate of the proportion of destination weddings for the Piedmont Triad? b. Find the standard error of the proportion. c. Find the critical value. d. Put it together to find the confidence interval. 7. You find out that respondents to The Knot’s survey were recruited from members of TheKnot.com. Do you trust that the survey results come from a representative sample? Why or why not?