1. Explain the meaning of a point estimate and a condence interval. What is the procedure to construct a condence interval for a parameter using StatCrunch? 2. Answer ON E of the questions below: I 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% condence. Explain what this means. I A Gallup poll of 54? 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 l4) percentage points with 95% condence. Explain what this means. 3. Answer ONE of the questions below: I Explain why the t-distriubtion has less spread as the number of degrees of freedom increases. I Explain why quadrupling the sample size causes the margin of error to be cut in half. 4. Why do polling companies oen survey 1060 individuals when they wish to estimate a population proportion with a margin of error 3% with 95% condence