Change in wireless only. Refer to the previous exercise. The percent increased to 31.6% in June 2011. Assume the same sample size for this sample.
(a) Find the proportion and the count for this sample
(b) Compute the 95% confidence interval for the proportion.
(c) Convert the estimate and confidence interval in terms of proportions to an estimate and confidence interval in terms of percents.
(d) Find the estimate of the difference between the proportions of households that are wireless only in June 2011 and the households that are wireless only in June 2006.
(e) Give the margin of error for 95% confidence for the difference in proportions.