Q7. (a) When is Median a much better method of Central Tendency than Arithmetic Suggest? (5marks) (b) Write about the 5 precautions of applying Secondary Info? (3 marks) (c) " You should be very very careful while developing a questionnaireвЂќ. Elaborate on the statement (2 marks)
Q8. (a) Write down any five methods of making a sample? Make clear briefly any kind of two methods? (5marks) (b) Two regression lines of the sample happen to be X+6Y=6 and 3X+2Y=0 Locate (I) The correlation coefficient (II) Indicate of By and Y (iii) Standard deviation of X if the Standard change of Sumado a is twenty-five (5marks) Q9. (a) The specifications pertaining to the production of the alloy necessitate 23. 2 gm of copper. A sample of 10 analysis of product showed a mean copper mineral content of 23. 5gm with a common deviation of 0. 24gm. Can we determine that in 0. 05 significance amounts that the item meets the required specifications? (5marks) (b) The following table displays the number divorce cases in hundreds in United states of america for the years 1986-1995. Develop a (I) 3years going average (II) 4years concentrated moving common YEAR| 1986| 1987| 1988| 1989| 1990| 1991| 1992| 1993| 1994| 1995| NO . OF DIVORCES| 42| 55| 70| 68| 79| 82| 67| 72| 59| 87
(5marks) Q10. (a) A Cell phone company performs a review to determine the possession of cell phones in different age ranges. The outcomes for one thousand households happen to be shown in the following desk. Test the hypothesis which the proportions owning cellular phones are identical for the different age groups employing Chi sq . distribution? Phone\ Age Groups| 18-24| 25-54| 55-64| > 65| Total| Yes| 50| 80| 70| 50| two hundred fifty
No| 200| 170| 180| 200| 750
Total| 250| 250| 250| 250| 1000|...