. Choose any current popular magazine (report the title and issue) and find the
ID: 3315596 • Letter: #
Question
. Choose any current popular magazine (report the title and issue) and find the proportion of pages that include advertising. Count every page that includes any advertising a. Based on this sample result, construct a 95% confidence interval estimate of the percentage of all popular magazine pages that have advertising. (See section 7-2 of the textbook for examples of such confidence intervals). b. Give a description of what this confidence interval tells you about magazine advertising c. What would change about your confidence interval if you changed the confidence level to 99%?Explanation / Answer
In a magazine of 121 pages, around 34 pages have ads.
a.
b.
From the above CI, we can conclude that thare are 95% probability that if a magazine of 121 pages selected randomly, proportion of pages havings ads would be in CI of (0.2009, 0.3611)
c.
n 121 p 0.280991736 z-value of 95% CI 1.9600 SE = sqrt(p*(1-p)/n) 0.04086 ME = z*SE 0.08009 Lower Limit = p - ME 0.20090 Upper Limit = p + ME 0.36108 95% CI (0.2009 , 0.3611 )Related Questions
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