A random survey of 8 month profit extracts for oceanic oil in millions were: 3.3, 2.8, 3.2, 3.1, 3.4, 2.9, 2.7 and 2.6 while for lake oil 10 months profits were: 2.9, 3.0, 3.4, 2.9, 3.2, 2.4, 3.1, 2.6, 2.8 and 2.7.

Taking Oceanic oil as population 1 and lake oil as population 2 determine:

a) 95% C.I estimate for the difference between the mean profits realised by Oceanic and lake oilthe

b) 95% C.I estimate for the profits realised by oceanic oil. A:B

c)the standard deviation for lake oil

d) the standard deviation for oceanic oil

e) the standard error for the difference between the sample standard deviation

g) the difference between sample means for oceanic and lake oil

h) the sample mean for lake oil

i)standard error for oceanic oil