81. While forming grouped frequency distribution the number of classes should be
82. Which design follow the number of rows = number of columns = Number of treatments
83. A good index number is one that satisfies
84. The value of QD in standard normal distribution will be
85. Unit of the IRDP
86. In case of normal distribution, B2 is
87. Coefficient of contingency is given by
88. To prove the worth of a new practice suited to a particular area, the best method of extension education is
89. Units of analysis and interpretation include
90. While testing the significance of the difference of two sample means in case of small samples. The degree of freedom is calculated by
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