Question 1. For given two regression equations x = – 0.4y + 6.4 and y = – 0.6x + 4.6, The mean of y is

• • (a)1
  • (b)2
  • (c)3
  • (d)4

Question 2. Chi-square is used to analyze:

1. 1. Squares
   2. Ranks
   3. frequencies
   4. All of above

Question 3. Calculate the co-efficient of correlation between x and y for the following data :

Question 4. Ten individuals are chosen at random from a population and their heights are found to be in inches 63, 63, 64, 65, 66, 69, 70, 70, 71. Discuss the suggestion that the Mean height of universe is 65. For 9 degree of freedom t at 5% level of significance = 2.262.