y save as you proceed through the test. 21/26 answered Time Remaining Show Question 5 [14 marks] Part a) (7 marks) The mean of a sample of 25 was calculated as mean of 500. The sample was randomly drawn from a population whose standard deviation is 15. Estimate the population means with 99% confidence. ii) Repeat part a changing the population standard deviation to 30 Part b) (7 marks) A random sample of 5 observations was drawn from a normal population. The same and standard deviation are X=175 and s=30. Estimate the population mean with 90% confidence. Repeat part i) assuming the population standard deviation o=30. 11 ) QB-5 Type your answer here. . X Q . = E 6 x H. =. B IA X. Hide Stop sharing Proctorio is sharing your screen