State whether the following statements are true or false and also give the reason in support of your answer:
a) The SD of 10 values of a data is 50. If each value is divided by 5, then the New SD will be 10.
b) The values of regression on coefficient bxy and bxy are and 20, respectively.
c) , then neither x nor yexceeds
, if the data is consistent.
d) If Y is proportional to X, then r(X, Y) = 1.
e) The mean weight of 150 students in a class is 60 kg. The mean weight of boys in the class is 70 kg and that of girls is 55 kg. Then the ratio of boys and girls in the class is 3:2.
a)
b)
c)
d) True
e) False
Total students in class = 150
mean weight = 60 kg
total weight = 150×60 = 9000 kg
Let the total number of boys = x
mean weight of
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Among the adult population of a certain town 50 percent are males, 60 percent are wage earners and 50 percent are 45 years of age or over, 10 percent of the males are not wageearners, and 40 per cent of the males are under 45 years. Make the best possible inference about the limits within which the percentage of persons (male or female) of 45 years or over are wage earners.
State whether the following statements are true or false and also give the reason in support of your answer:
a) The SD of 10 values of a data is 50. If each value is divided by 5, then the New SD will be 10.
b) The values of regression on coefficient bxy and bxy are and 20, respectively.
c) , then neither x nor yexceeds
, if the data is consistent.
d) If Y is proportional to X, then r(X, Y) = 1.
e) The mean weight of 150 students in a class is 60 kg. The mean weight of boys in the class is 70 kg and that of girls is 55 kg. Then the ratio of boys and girls in the class is 3:2.
Calculate the coefficient of rank correlation for the following data:
| X: | 48 | 33 | 40 | 09 | 16 | 16 | 65 | 24 | 16 | 57 |
| Y: | 13 | 13 | 24 | 06 | 15 | 04 | 20 | 09 | 06 | 19 |
800 candidates of both sexes appeared at an examination. The boys outnumbered the girls by 15% of the total. The number of candidates who passed exceeds the number failed by 480. Equal number of boys and girls failed in examination. Prepare a 2 x 2 table and find the coefficient of association. Also comment.
A number of particular articles has been classified according to their weights. After drying for two weeks the same articles have again been weighted and similarly classified. It is known that median weight in the First Weighing was 20.83 gm, while in the Second Weighing it was 17.35 gm. Some frequencies a and b in the First Weighing and x and y in the Second Weighing are missing. It is known that . and
Find out the values of the missing frequencies.
Class: 0-5 5-10 10-15 15-20 20-25 25-30
Ist Weighing: a b 11 52 75 22
IInd Weighing: x y 40 50 30 28
Calculate Karl Pearson’s coefficient of correlation between X and Y for the following data:
In a trivariate distribution:
1 = 2,
2 =
3 = 3, r12 = 0.7, r23 = r31 = 0.5
Find (i) r23.1 , (ii) R1.23 , (iii) b12.3 , b13.2 and (iv) 1.23