71.
Statistical average has significance due to following sequence.
1. To present huge mass of data ina summarised form.
2. To facilitate comparison of different sets of data.
3. To help decision-making.
Select the correct answer using the options given below

72.
We call the classification of employees on the basis of education and attributes

74.
Consider the following statements.
Statement-I: When a null hypothesis gets rejected in statistical hypothesis testing, it is known as II type error in hypothesis testing.
Statement-II: When a sample is small sized and parametric value of the standard deviation is not known, z-test is the most appropriate test for hypothesis testing.

77.
Regression model is a statistical framework for developing a mathematical equation that describes how:

78.
Which of the following statement(s) is/are correct?

79.
If the number of observations is such that nx ny is large (n > 20), a normal approximation can be used with