A new drug to help ease bronchitis, a lung infection, is developed and needs to be inhaled using an aerosol. Two types of aerosol (X and Y) have been developed and the company wishes to test whether there is a difference in the average effectiveness of the aerosols. Ten patients participate in the trial, in which the patient breathes in before using the aerosol and afterwards. The percentage increase in air intake is measured and recorded.

Test, at the 5% significance level, whether or not there is any difference in the average effectiveness of the aerosols. 

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B. D. E G H 1. 27 22 11 41 19 57 48 41 35 37 Y 23 18 7 18 24 63 31 23 21 28