Question : Consider a random sample of 10 patients using a drug A for headache remedy yields sample mean and variance as 12.3 minutes and 6.54 minutes, while a random sample of 10 other patients using drug B gives sample mean and variance as 10.1 minutes and 4.1 minutes. Find a 95% confidence interval for the true difference in the mean relief times.

--------------------------My work ---------------------------

= 0.05 degree of freedom = 0.95

Is this correct what i am trying to do ???