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Statistics Questions

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Question;1.Find the minimum sample size required to;estimate a population proportion or percentage.;Fortune Tellers-Find the sample size needed to;estimate the percentage of adults who have consulted fortune tellers. Use a.03;margin of error, use a confidence level of 98%, and use results from a prior;Pew Research Center poll suggesting that 15% of adults have consulted fortune;tellers.;2. Find the max and minimum earthquake;magnitudes, then use those values with the range rule of thumb to estimate Q.;How many earthquakes must you randomly select if you want to be 95% confident;that sample mean magnitude is within.2 of the true population mean M? The;standard deviation of the 50 earthquake magnitudes in the data set is.587.;Find the required sample size by using the standard deviation of the sample as;an estimate of Q. Which of the two results is likely to be better?;Mag;0.70 2.20 1.64 1.01 1.62 1.28 0.92 1.00 1.49;1.42;0.74 1.98 1.32 1.26 1.83 0.83 1.00 2.24 0.84;1.35;0.64 0.64 2.95 0.00 0.99 1.34 0.79 2.50 1.42;0.93;0.39 1.22 0.90 0.65 1.56 0.54 0.79 1.79 1.00;0.40;0.70 0.20 1.76 1.46 0.40 1.25 1.44 1.25 1.25;1.39;Depth;6.6 2.2 18.5 7.0 13.7 5.4 5.3 5.9 4.7 14.5;2.0 14.8 8.1 18.6 4.5 17.7 15.9 15.1 8.6 5.2;15.3 5.6 10.0 8.2 8.3 9.9 13.7 8.5 8.2 7.9;17.2 6.1 13.7 5.7 6.0 17.3 4.2 14.7 15.2 3.3;3.2 9.1 8.0 18.9 14.2 5.1 5.7 16.4 10.1 6.4;3 Use the ages of the presidents at times of;their inaugurations. Treating data as a sample, construct a 98% confidence;interval estimate of the standard deviation of the population of all such ages.;Presidents;Wash. 57;Adams 61;Jefferson 57;Madison 57;Monroe 58;J. Adams 57;Jackson 61;Van Buren 54;Harrison 68;Polk 49;Taylor 64;Peirce 48;Buchanan 65;Lincoln 52;Grant 46;Hayes 54;Garfield 49;Cleveland 47;B. Harrison 55;McKinley 54;Roosevelt 42;Taft 51;Wilson 56;Harding 55;Coolidge 51;Hoover 54;F. Roosevelt 51;Truman 60;Eisenhower 62;Kennedy 43;Johnson 55;Nixon 56;Carter 52;Reagan 69;Bush 64;Clinton 46;Bush 54;Obama 47

 

Paper#60242 | Written in 18-Jul-2015

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