ECO-07 Solved Assignment Elements of Statistics (English Medium)

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ECO-07 Solved Assignment For IGNOU
Course Title: Elements of Statistics

Following questions are answered in this solution:

Q. 1. What is sampling? Explain various methods of sampling?

Q. 2. Differentiate between primary data and secondary data. Describe the factors that affect the choice of data to be used in investigations.

Q. 3. (a) Find the missing frequency from the following data.
Marks 0-10 10-20 20-30 30-40 40-50 50-60
No. of students 15 25 30 – 30 20
Arithmetic mean of marks is 44.

(b) Calculate mode from the data given below:
Profit (Rs. In Lakh) : 0-5 5-10 10-20 20-30 30-50
No of Companies : 2 3 8 9 10

4. Calculate mean and standard deviation from the following distribution:
Class Interval : 10-20 20-30 30-40 40-50 50-60 60-70 70-80
Frequency : 2 4 4 8 6 3 2

Q. 5. Write short notes on the following:
(a) Skewness
(b) Sampling and Non sampling
(c) Lorenz Curve
(d) Schedule and questionnaire