2nd homework 006

2nd homework 006 - Statistics Prof. Giuseppe Arbia NYU -...

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Pagina 1 di 2 Statistics NYU - Spring 2012 Prof. Giuseppe Arbia V31.0018 - 006 2 nd homework Thursday February, 2 nd 2012 Answer each of the questions. Read the questions carefully and keep your answers brief and to the point. PLEASE WRITE NEATLY. Please leave your homework in the mailbox of your respective Teaching Assistant by Tuesday at 8:00. Because the homework will be discussed during the Lab sessions no late homework can be accepted. Good work ! Question 1 : Calculate, if possible, the mean the mode and the median of the variable: Y={Bad, Good, Vary bad, Very good, Bad, Bad, Good, Very bad, Good, Good, Bad, Very bad, Very good, Very bad, Very bad }. Question 2: (a) Demonstrate that: 22 2 11 () i NN ix ii x xx Var X μ == = = ∑∑ (b) Demonstrate that the coefficient of variation is a “scale-free” measure. Question 3: The following table reports the weight in kilos and the height in centimeters of 15 students observed in a class. Individuals 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Weight 70 58 62 51 73 58 48 68 59 54 48 55 55 55 73 Height 180 170 168 156 180 167 172 174 169 160 162
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2nd homework 006 - Statistics Prof. Giuseppe Arbia NYU -...

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