Probability and Statics BS 2 Semester/Term University Of Sargodha (UOS) 2021
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Paper text
ustad
ustadni.
Subject: IT & CS
University of Sargodha
BS 2ºd Semester/Term Exam 2021
Paper: Probability and Statistics (Math-102)
Time Allowed: 02:30 Hours
Maximum Marks: 60
Note: Objective part is compulsory. Attempt any three questions from subjective part.
Objective Part
(Compulsory)
Q.1.
Write short answers of the following in 2-3 lines each on your answer sheet.
(2*12)
Write any use of Statistics in computer science
Explain the difference between discrete and continuous variables
int.
in
Define mean?
State multiplication law of probability of two independent events
When we use t-test?
yi:
Vil.
vili.
ix.
x.
xin
xii.
Define secondary data
Write two properties of variance
Write two properties of Poisson distribution
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Write two properties of hypergeometric distribution
Define sampling
Define alternative hypothesis
Define correlation
Subjective Part
(3*12)
a) Discuss types of statistics and write some applications in computer science.
b) In an experiment to study the relationship of hypertension and smoking habits, the following data
are collected for 180 individuals
Nonsmokers
Moderate smokers
Heavy Smokers
H
NH
48
26
19
Where H and NH in the table stand for Hypertension and Non hypertension respectively. If one of
these individuals is selected at random find the probability that the person is
(i).
Experiencing Hypertension, given that the person is a heavy smoker
(ii).
Q.3.
A nonsmoker given that the person experiencing no Hypertension
a) Write a procedure for testing of independence
b) Two tire-quality experts examine stacks of tires and assign quality ratings to each tire on a 3-point
scale. Let X denote the grade given by expert A and Y denote the grade given by B. The following
table gives the joint, distribution for A' and Y.
J (x,y)
3
1
0.10
0.10
0.03
0.05
0.35
0.10
0.02
0.05
0.20
(i). Find #,
(ii).Find 4,
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