any local businesses support the idea of an Internet sales tax, helping them compete with large online retailers. A nationwide survey of 1397 randomly chosen Americans and found a 95% confidence interval for the proportion who support Internet sales tax to be (0.30, 0.38). (a) Which inference procedure is appropriate in this context?

one sample t-interval two sample t-interval t-interval for paired data one sample z-interval

(b) How should this confidence interval be interpreted?

With 95% confidence, a randomly chosen American who supports Internet sales tax is inside this interval. With 95% confidence, the proportion of Americans who support Internet sales tax from this sample of 1397 people is inside the interval. With confidence, 95% of Americans who support Internet sales tax are inside this interval. With 95% confidence, the proportion of all Americans who support Internet sales tax is inside this interval.

(c) What is the margin of error of this survey? What is the sample statistic, p? (d) Suppose we changed the confidence level to 99%. How would the following quantities change? The standard error would . The critical value would . The confidence interval would become .