Class name Subject Book title Chapter number Content Created at
Class XI Economics Statistics for Economics 5 Assumed mean. Families Income d = X – 850 d' Thus, you can calculate the (X) = (X – 850)/10 A 850 0 0 arithmetic mean in the example 2, by the step...
Class XI Economics Statistics for Economics 5 Step deviation method. Direct Method Two interesting properties of A.M. Marks 0–10 10–20 20–30 30–40 40–50 (i) the sum of deviations of items 50–60...
Class XI Economics Statistics for Economics 5               ...
Class XI Economics Statistics for Economics 5 frequency distributsion of the 25, 28, 29, 30, 32, 33, 33, 35, 42, number of persons and their respective incomes (in Rs) are given 45, 46, 47, 48,...
Class XI Economics Statistics for Economics 5 = (i.e.160/2) = 80thitem of the series, which lies in 35–40 class interval. Where, L = lower limit of the median class, Applying the formula of the...
Class XI Economics Statistics for Economics 5 the data into four equal parts, Calculation of Quartiles each portion contains equal number of The method for locating the Quartile is observations...
Class XI Economics Statistics for Economics 5 of mode is 30. In this case, as there is a unique = 12 + .75(14 –12) = 13.5 marks. value of mode, the data is unimodal. But, the mode is not necess...
Class XI Economics Statistics for Economics 5 frequency Income Group Frequency 2 (in ’000 Rs) of the modal class and the frequency of 45–50 97 – 95 = 2 the class succeeding the modal class 40–4...
Class XI Economics Statistics for Economics 5 • Which average will be most appropriate for the companies Measures of central tendency or producing the following goods? averages are used to summ...
Class XI Economics Statistics for Economics 5 median is equal to the number greater than the median. • Quartiles divide the total set of values into four equal parts. • Mode is the value which ...
Class XI Economics Statistics for Economics 5 50-60 Number of retail shops 12 18 27 - 17 6 (Ans. The value of missing frequency is 20 and value of the median is Rs 27.41) 5. The following table...
Class XI Economics Statistics for Economics 5 30 36 28 16 10 5 (Ans. mean = 63.82 kg. per hectare, median = 63.67 kg. per hectare, mode = 63.29 kg. per hectare) Reprint 2026-27
Class XI Economics Statistics for Economics 6 C HAPTER Correlation Studying this chapter should As the summer heat rises, hill enable you to: stations, are crowded with more and • understand th...
Class XI Economics Statistics for Economics 6 deaths due to drowning. The victims are not drowned due to eating of ice- • Do both the variables move in the creams. Rising temperature leads to s...
Class XI Economics Statistics for Economics 6 ranks assigned to indiviual items according Correlation is commonly classified into negative and positive to their attributes. Attributes are those...
Class XI Economics Statistics for Economics 6 6.1 to Fig. 6.5 give us an idea of Reprint 2026-27 CORRELATION 77 the relationship between two variables. correlation coefficient. It gives a preci...
Class XI Economics Statistics for Economics 6 and marks scored by students It is, therefore, advisable to first in your class in any two subjects in class X. Draw the scatter examine the scatte...
Class XI Economics Statistics for Economics 6 - Y) Â xy Let us now discuss the properties of the Cov(X,Y) = = correlation coefficient N N • r has no unit. It is a pure number. It means units of...
Class XI Economics Statistics for Economics 6 close to +1 or –1. • A low value of r (close to zero) indicatesaweaklinearrelation.But there may be a non-linear relation. As you have read in Chap...
Class XI Economics Statistics for Economics 6 calculation of r • If r = 0 the two variables are uncorrelated. There is no linear by examining the relationship between relation between them. How...
Class XI Economics Statistics for Economics 6 Σ (X–X ) =112 Σ Y=49 Σ (Y–Y) =38 Σ (X–X)(Y–Y)=42 Reprint 2026-27 82 STATISTICS FOR ECONOMICS taken care of by a good transport  XY - (ÂX)(  Y) ne...
Class XI Economics Statistics for Economics 7 sensex? Case 3 Conventionally, index numbers are The government says inflation rate will not accelerate due to the rise in the pricepressed in term...
Class XI Economics Statistics for Economics 6 16 25 1997–98 12 25 when r is –0.9. The extent of price fall 1998–99 16 23 depends on the absolute value of r. Had it been zero, there would have 1...
Class XI Economics Statistics for Economics 6 Ë 10 ¯ Ë 100 ¯ U2 V2 UV Spearman’s rank correlation was developed by the British psychologist 2 1 4 1 2 C.E. Spearman. It is used in the 5 3 25 9 1...
Class XI Economics Statistics for Economics 6 correlation it lies between 1 and relation between variables, at least –1. However, generally it is not as one of which is of this type, then accur...