Attempt all the questions

1. What is statistical survey? Discuss the steps to be followed while conducting statistical survey. (20)

2. Central tendency, dispersion an skewness are three different measures to analyse numerical data. Comment. (20)

3. Calculate a) Mean, b) Variance and c) Standard deviation from the following frequency distribution:-

                Classes                    Frequency

                 1-10                              11

                10-20                             29

                20-30                             18

               30-40                               4

                40-50                              5

               50-60                               3

4. a) What is the relationship between Mean. Median and Mode:

(i) Symmetrical curve

(ii) A negatively slewed curve

(iii) A positively skewed curve b) For a frequency distribution: Q3-Q2 = 40 & Q2-Q1=60 Find coefficient of skewness. (10+10)

5. Write short notes on the following - (5×4)

a) Principle of preparing graphs.

b) Statistical Table

c) Data Array

d) Properties of Normal Curve.