Solapur University CELL BIOLOGY AND BIOSTATISTICS Biostatistics (Paper – II) 2015 Question Papers

Solapur University
B.Sc. – I (Semester – I) (Biotechnology) (Old) Examination, 2015
CELL BIOLOGY AND BIOSTATISTICS
Biostatistics (Paper – II)
Day and Date : Saturday, 18-4-2015 Max. Marks : 50
Time : 11.00 a.m. to 1.00 p.m.
Instructions : 1) All questions are compulsory.
2) Figures to the right indicates full marks.
3) Use of calculator is allowed.
1. Multiple choice questions : 10
1) Parameter is a statistical measure which relates to ______________
a) Sample b) Population c) Census d) None of these
2) If A and B are mutually exclusive events defined on Ω then p (A/B) =
______________
a) 0 b) 1
c) Between 0 and 1 d) None of these
3) Which of the following is not a possible probability ?
a) 0.3 b) 0.03 c) 3.0 d) 0.003
4) Arithmetic mean of regression coefficient is ______________ the correlation
coefficient if correlation is positive.
a) Less than b) Greater than
c) Equal to one d) None of these
5) In the scatter diagram, if ______________ then there is no correlation.
a) r = +1 b) r = –1 c) r = 0 d) None of these
6) In a distribution if β2 = 2.45 then the distribution is ______________
a) Leptokurtic b) Mesokurtic
c) Platykurtic d) None of these
P.T.O.
SLR-M – 14 -2-
7) In the scatter diagram, if r = ______________ then there is positive correlation.
a) +1 b) –1 c) 0 d) None of these
8) If the Karl Pearson’s coefficient of skewness Skp
 < 0 then the distribution is
______________
a) Symmetric b) Positively skewed
c) Negatively skewed d) None of these
9) Percentiles are those value of the variate which divides the series into
______________ equal parts.
a) 9 b) 99 c) 10 d) 100
10) The correlation coefficient is the ______________ between the regression
coefficient.
a) Arithmetic mean b) Geometric mean
c) Harmonic mean d) None of these
2. Answer five of the following : 10
1) Define Binomial Distribution.
2) Explain error of sampling in testing of hypothesic.
3) If Q1 = 30 and Q2
 = 50 then calculate the coefficient of Q.D.
4) Explain exclusive method of classification.
5) Define mean deviation and its coefficient.
6) Find the median of 7, 5, 12, 9, 8, 21, 14, 16, 25.
3. A) Answer any two of the following : 6
1) Explain the difference between absolute measure and relative measure.
2) Skewness
3) Calculate median from the following data :
x 58 61 62 63 64 65
f 12 20 22 15 17 14
B) Write short note on tabulation. 4
-3- SLR-M – 14
4. Answer any two of the following : 10
1) Calculate the standard deviation and the coefficient of variation :
x 20 – 30 30 – 40 40 – 50 50 – 60 60 – 70
f 35 60 32 53 25
2) What is regression ? Explain lines of regression Y on X and line of regression
X on Y. State coefficient of regression.
3) From the following data find missing frequency when mean is 15.38 :
Size 10 12 14 16 18 20
Frequency 3 7 ? 20 8 5
5. Answer any two of the following : 10
1) From the following information, calculate regression equation y on x
∑x = 30, ∑x = 220, ∑y = 40, ∑y = 340, ∑xy = 214, 2 2 n = 5.
2) Let X be a discrete random variable with p.m.f.
15
x P (X = x) = , x = 1, 2, 3, 4, 5
 = 0, otherwise.
Find E(x) and Var(X).
3) What do you mean by measures of central tendency ? State the important
properties of arithmetic mean.
_____________

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