CRUX OF STATISTICS B.COM-1, A.B.S.T-2

Q.1 Define Statistics.

Q.2 Give a main definition of statistics in Singular Sense. Q.3 What do you understand by Data? Q.4 Point out three characteristic of data. Q.5 Write two causes of distrust of statistics. Q.6 Give two limitations of statistic. Q.7 What do you mean by primary data? Q.8 State the meaning of Secondary Data. Q.9 What are the main sources of secondary data. Q.10 Give the meaning of universe. Q.11 Give the main difference between Questionnaire and schedule. Q.12 What is random Sampling? Q.13 Name four methods of collection of primary data. Q.14 Write the difference between primary data and secondary data? Q.15 What is main differences between Census and Sample investigation? Q.16 What is meant by unbiased errors? Q.17 What is the law of inertia of large numbers? Q.18 What do you mean by classification and objects of classification. Q.19 Define tabulation and objects of tabulation.

Q.20 Wages are given for 50 workers. The maximum and minimum wages are Rs 400 and 80 respectively and 10 classes of equal class intervals are to be formed.How will you find out the class interval? Q.21 Why an average is known as a measure of central tendancy? Q.22 What is mode? Q.23 What is an arithmetic average. Q.24 State the characteristics of Geometric Mean. Q.25 What do you mean by dispersion? Q.26 Differentiate between absolute and relative measure of dispersion. Q.27 If the mean and standard deviation of a series of 100 values are 60 and 5 respectively. Find the sum of item values and the sum of squares of item values. Q.28 When are the values of Mean, Mode and Median equal. Q.29What is the relationship between mean, median and mode in case of negative skewness. Q.30 What is the formula given by Bowley for measuring skewness? Q.31 If the variance of series is 144 and the mean is 50, find out the coefficient of variation. Q.32 What is difference between dispersion and skewness.] Q.33 State the Fisherâ€™s formula of Time Reversal Test. Q.34 What do you mean by deflating of Index Number. Q.35 Why the Fisherâ€™s formula called an ideal formula? What are its demerits? Q.36 State the meaning of correlation. Q.37 What do you mean by negative correlation?

Q.38 Give the formula for finding out probable error and standard error. Q.39 Define Regression. Q.40 Why there are two regression lines? Q.41 What is difference between regression and correlation? Q.42 If two regression coefficients are .8 and .6. Find the value of coefficient of correlation. Q.43 What do you understand by one dimensional diagram? Q.44 What is a cumulative frequence or ogive curve. Q.45 what is the difference between Historigram and Histogram. Q.46 What is false base line? Q.47What do you understand by moving average? Q.48 what do you mean by probability? Q.49 Define permutation and combinations. Q.50 Differentiate between interpolation and extrapolation. IMPORTANT PRACTICAL CHAPTER : 1) Mean, Median,Mode 2) Fishers Index number 3) Standard Deviation 4) Correlation 5) Regression THEORETICAL QUESTION :

1) Define Regression. Why are there two regression lines? Under what conditions can there be only one regression line? 2) Why sampling is necessary in statistical investigations? Explain the method of sampling. 3) Differentiate between primary data and secondary data. Examine critically the important method of collection of primary data. 4) Define statistics. Discuss its scope and limitations. 5) What is questionnaire? What precautions should be taken in drafting a good questionnaire?