A pharmaceutical company recruited 15 subjects and conducted experiment to test one medication with three doses (5 subjects per dose) for controlling cholesterol. One month later, these subjects were measured on the cholesterol (mg/dL). And the results are followed :

Dose 1	Dose 2	Dose 3
200	150	200
250	200	240
270	180	230
300	250	245
250	270	250

Research Question: whether there are mean differences of cholesterol among different doses.

1. Write the test hypothesis
2. Construct and fill out the ANOVA table by hand (show your work)
3. State your conclusion