1 Critical Value: Our sample has size of 30, and so there are 29 degrees of freedom. 2  The critical value for confidence level of 90% is given by t * = 1.699.3  Margin of Error: Now we use the margin of error formula and obtain a margin of error of t * s /â n = (1.699)(2) /â(30) = 0.620. Critical Value: Our sample has size of 30, and so there are 29 degrees of freedom. 2  The critical value for confidence level of 90% is given by t * = 1.699.
vasodilator as diltiazem. Minimum therapeutic plasma diltiazem concentrations appear to be in the range of 50 to 200 ng/mL. There is a departure from linearity when dose strengths are increased; the half-life is slightly increased with dose. A study that compared patients with
Mild headache, perianal itching and perianal dermatitis have been reported with the use of 2% topical diltiazem hydrochloride. The NHS price for 2% diltiazem cream is Â£73.83 per 30 g tube and the NHS price for 2% diltiazem ointment is Â£163.07 per 30 g tube.