1. Explain the meaning of a point estimate and a confidence interval. What is the procedure to construct a confidence interval for a parameter using StatCrunch? 2. Answer ONE of the questions below: A Rasmussen Reports national survey of 1000 adult Americans found that 18% dreaded Valentine's Day. The margin of error for the survey was 4.5 percentage points with 95% confidence. Explain what this means. A Gallup poll of 547 adults Americans employed full or part time asked, "Generally speaking, would you say your commute to work is - very stressful, somewhat stressful, not that stressful at all?" Gallup reported that 24% of American workers said that their commute was "very" or "somewhat" stressful. The margin of error was four (4) percentage points with 95% confidence. Explain what this means. 3. Answer ONE of the questions below: Explain why the t-distriubtion has less spread as the number of degrees of freedom increases. Explain why quadrupling the sample size causes the margin of error to be cut in half. 4. Why do polling companies often survey 1060 individuals when they wish to estimate a population proportion with a margin of error 3% with 95% confidence?