STT102: Introductory Statistics TMA3 Question and answer

Question 1: let the age be as described earlier such that x = 18, 19, 20, 21, 22, 25, 27, 30, 32. Standard deviation in years?

Answer is : 4.5Years

Question 2: find the means injection of Nurse three N_3 in

Nurse (N_1)	Nurse (N_2)	Nurse (N_3)	Nurse (N_4)	Nurse (N_5)
25	41	27	32	43
66	35	31	15	05
30	38	30	20	21
34	26	32	28	16

Answer is: 30

Question 3: find the standared variation in X = 24,12,8,20,3,18,24,25,27,10,9,26,25,23,22,16,15,24,19,21.

Answer is: 6.87

Question 4: which of these two drugs is more effective?

	Drugs 1	Drugs 2
means	100	180
Standard deviation (s)	50	70

Answer is: drugs 1

Question 5: the ages (x) of recipient of Nursing Scholarship as as follow x = 18, 19, 20, 21, 22, 25, 27, 30, 32. Find the means age?

Answer is: 24.2

Question 6. What is the standared deviation of the survibal times in X= 3,8,12,18,19,20,24,25,27?

Answer is: 7.4162

Question 7. The survival times (x) are as stated below X= 3,8,12,18,19,20,24,25,27?

Find the means survival times?

Answer is 18

Question 8: as we have in 8 and using the most numerical summary to draw on the administration of injections, determine which asignment is less than 24hrs

Nurse (N_1)	Nurse (N_2)	Nurse (N_3)	Nurse (N_4)	Nurse (N_5)
25	41	27	32	43
66	35	31	15	05
30	38	30	20	21
34	26	32	28	16

Answer is: Nurse5

Question 9: using no 8, find which is more efficient between Nurse 2 and Nurse 3

Nurse (N_1)	Nurse (N_2)	Nurse (N_3)	Nurse (N_4)	Nurse (N_5)
25	41	27	32	43
66	35	31	15	05
30	38	30	20	21
34	26	32	28	16

Answer is Nurse3

Question 10: consider this record of survival times (x). X = 24,12,8,20,3,18,24,25,27,10,9,26,25,23,22,16,15,24,19,21. Find the means survival rate?

Answer is: 18.55