55.
Sum of squares between samples is given by

56.
Total variation between column mean equals

57.
Match the following columns
Column I Column II
a. If $$\frac{{\left( {\text{A}} \right) \times \left( {\text{B}} \right)}}{{\text{N}}} = {\text{AB,}}$$    the attributies are called 1. + 1
b. The Yule's coefficient of association varies between 2. Independent
c. Index numbers are 3. 1764
d. Historically the first index was constructed in 4. Specialised averages

59.
Match the following columns
Column I (Aids) Column II (Method of contact)
a. Model 1. Group contact
b. Slide 2. Mass contact
c. Telephone call 3. Personal contact
d. Poster 4. Mass contact

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