Question

A pharmaceutical company introduced a new drug that would reduce cholesterol levels. A researcher selected 10 cholesterol patients and tested them for their cholesterol level. The subjects were then placed on the new drug for a period of 6 months, and the cholesterol level reading was taken again. Both the results are given below. Assume the samples are random and dependent, and the populations are normally distributed. Use 0.01 level of significance and test whether there is evidence of reduced cholesterol level.

Subject	A	B	C	D	E	F	G	H	I	J
Before	196	224	201	196	176	259	265	193	240	268
After	181	219	209	176	170	229	255	190	240	250

a) Use the critical value approach, test whether there is evidence of reduced cholesterol level. Include all key steps of the test. [10 marks]

**This question requires long hand without the use of programs like excel. - full formula. I keep getting conflicting answers and can't settle on the right formula to use.

Answer 1