Guru Gobind Singh Indraprastha Vishwavidyalaya 2012 B.B.A Qtor - exam paper
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Manaraja Agrasen institute or ivianagemeni studies First Internal Examination 2nd Semester - BBA (Gen), B&I Subject - QTOR, Subject code -106
Time:2 hrs
Note: Attempt all questions. All questions carrying equal marks.
Q1 Define Statistics. What are the scope and limitations of statistics? Jjonsider the following distribution
Wages |
Frequencies |
Wages |
Frequencies |
0-10 |
12 |
40-50 |
? |
10-20 |
18 |
! 50 20 |
25 |
20-30 |
. ? |
60-70 |
1& |
30-40 |
40 |
Total |
170 |
The median of the following wage distribution is known to be Rs. 35. The frequencies from the table are missing. Find these missing values.
c/fhe numbers 3.2, 5.8, 7.9 and 4.5 have frequencies x, x+2, x-3, and x+6 respectively. If arithmetic mean is 4.876. Find the value of
Q2. For 10 observations on price X and supply Y, the following data are ofeined.
SXY = 3467, =130, X2288, Y =220,1 f2 - 5504
(JbtaiiTthe line of regression of y on x and x ci: y. Also estimate the supply when the price of 16 units.
OR
jThe line of regression of marks in Statistics (X) cn marks in Accountancy (Y) for class of
50 students is:
Average marks.in Accountancy is 44 and variance of marks is 9/16 of variance of marks in Accountancy. Find:
i. The average marks in Statistics.
ii. Coefficient of corrdatic" between marks in Statistics and Accountancy.
fffical-mlate the coefficient of variance of th; following data. \. | ||||||||||||||||||||||||
|
0R
The arithmetic mean ax i standard deviation of series of 20 items were calculated as 20 and 5 cm. But while calculating 13 was misread as 30, Find correct mean and correct standard deviation.
tSss than 10 |
Less than 20 |
Less than 30 |
L>Ss than 40 |
Less1 than 50 |
Less than 60 |
Less than 70 |
Less than 80 |
13 |
20 |
3T |
CO |
80 |
90 |
100 |
3 MakinS use of the data summarized below, calculate the coefficient of correlation using Rank correlation
OR
Compute the Karl Pearson coefficient of correlation of data given below
Case |
i ' X1 |
X2 |
Case |
X1 |
X2 |
A |
10 |
9 |
E |
12 |
11 |
B B |
6 |
4 |
F |
13 |
13 |
C |
9 |
6 |
G |
11 |
8 |
Q D |
10 |
9 |
H |
9 |
4 |
Attachment: |
Earning: Approval pending. |