Benrahou KenzaKhaliss OumaimaYacoubi ZakariaDr. Kounou Martin Spring 2018
Yong Professional Magazine (Case study 1, chapter 8)2. From the above detailed statics the 95 % confidence interval is= 30.09±0.39= (29.7, 300.48)3. From the above results 95% confidence interval is =74457.7±3388.5= (71069.2, 77846.2)Hence the interpreter is 95% confident that the mean household income between 71069.2 to 77846.2 thousands4. From the above result it can be observed that 95% confidence interval of subscribers with broadband.=0.62±0.047= (57.3, 66.7)Hence the interpreter is 95% sure that 57.3% to 66.7% subscribers have broadband access.Hence young professionals would be a good advertising outlet for online brokers5. From the above calculations the 95% confidence interval of subscribers havingchildren is=0.533±0.048= (0.485, 0.581)Hence the interpreter is 95% sure that 48.5% to 58.1% subscribes have children0. This means only half of the readers will be interested in reading articles related to software and games for young children. Hence the magazine is not a good place for advertisements of software and computer games.6. Young professions magazine is aimed tat professionals who have graduated within 10 years. Hence the articles of interest would be of topics on finance, buying real estate, internet resources, child care etc.Gulf real Estate Properties (Case study 2, chapter 8)3. On comparing the results of ‘Gulf View’ and ‘No Gulf Vie’ condominiums there is marked difference between mean List price and mean Sell price. While the list price of ‘Gulf view’ condominiums is 474 thousands that of ‘No Gulf View’ condominiums is 212.8 thousands. Similarly the sell price of ‘Gulf view’ is higher than ‘No Gulf view’ condominiums.The number of days to sell is higher for ‘No Gulf view’ properly compared to ‘Gulf view’. ‘Gulf view property is sold in 106 days while ‘No Gulf view property is sold in 135 days.4. From the above result it is observed that 95% confidence interval of Sell price in ‘Gulf view’ condominiums is =454±61.5= (392.5, 515.5)Hence there is 95% confidence that sell price of a Golf view condominium is between 392.2 to 515.5 thousand dollars. Also the 95% confidence interval of days to sell is
=106±16.7= (89.3, 122.7)Hence there is 95% confidence that number of days of a Gulf course condominium will sell between 89.3 to 122.7 days.5. From the above result we observe that 95% confidence interval of Sell price in ‘No Gulf view’ condominium is =20.3±21.8= (181.2, 224.8)Hence there is 95% confidence that sell price of a No golf view condominium is between 181.2 to 224.8 thousand dollars.6. Interval estimate of mean when σis known is The desired margin of error isHence sample size of sample population is given by For 95% confidence intervalZ0.025=1.96The branch manager needs estimate of mean selling price of Gulf view condominiums with margin error. E= 4000From the detailed statistics calculation in excel sheet the standard deviation is σ=192.5Hence the required sample size is n=89Hence the sample size should be 89 for estimates of mean selling price of Gulf view condominiums.