Assignment No.2 (Course STA301) Fall 2011

 Assignment.2 (Lessons 11-16)

Question 1:                                                                                                                 Marks: 5+5=10

a.       Top ten students in MCS class in VU have following marks division in a CS paper.

89, 90, 85, 88, 83, 79, 95, 93, 81, 80

Calculate the fraction of data falling in the limits,  and.

b.      For a certain data, Mean = 4, Median = 3 and Standard Deviation = 2.Find Pearson’s coefficient of skewness by using mode and interpret the results.

Question 2:                                                                                                                 Marks: 5+5=10

a.       First four moments about zero are given below

       Find the coefficient of skewness and kurtosis.

b.      For a certain data, we have following information

Calculate percentile coefficient of kurtosis and interpret the result.

Question 3:                                                                                                           Marks: =2.55=10

Ages and weights of Lahore city are given in the following table

Ages (X)	17.5	18.2	19.5	21	25	26	28	30	35	40	50
Weights (Y)	35	37	39	35	55	49	74	60	80	60	55

Calculate

i.                     Simple regression line age on weight.

ii.                   Standard error of estimate for this line.

iii.                  By using the line, estimate the value of weights at the age of 55.

iv.                  Check, is there significant relation between ages and weights?