73.
Which of the following formula is not correct? Select your answer from the options given below

75.
If a number of chi-square values have been obtained from a number of samples similar data, then because of the additive nature of chi-square we can combine the various values of chi-square by just simply . . . . . . . . them.

78.
Type of cumulative frequency distribution in which class intervals are added in top to bottom order is classified as

79.
In the application of chi-square,
1. no theoretical frequency should be small since in the derivation of chi-square continuity assumptions are made.
2. the constraint imposed on cell frequencies must be linear.
3. regroup the frequencies whenever some expected frequency was small.
4. the correction is needed, when some cell frequency was small, i.e. less than 5.
Which of the statements given above are correct?