The diastolic blood pressure readings for 15 patients were determined using two techniques: the standard method used by medical personnel and a method using an electronic device with a digital readout. The results were as follows:

Assuming blood pressure is normally distributed, determine the 90% confidence interval for the mean difference in the two readings,where d standard method digital readout.

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Patient 1 2 3 4 5 6 7 89 10 11 12 13 14 15 Standard 72 80 88 80 80 75 92 77 80 65 69 96 77 75 60 method Digital 70 76 87 77 8 75 90 75 82 64 72 95 80 70 61 method