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A hospital implements a new automated blood pressure device. They conduct two studies:
Study 1 (Reliability Test): Each of 80 patients is measured twice by the device within 5 minutes (no actual BP change expected). Measurements correlate at ; the mean difference is 1.2 mmHg with SD of 2.1 mmHg.
Study 2 (Validity Test): The same 80 patients are measured once by the new device and once by a trained nurse using a gold-standard manual cuff (within 30 minutes). Device and manual readings correlate at .
Which statement is most accurate?
A hospital implements a new automated blood pressure device. They conduct two studies:
Study 1 (Reliability Test): Each of 80 patients is measured twice by the device within 5 minutes (no actual BP change expected). Measurements correlate at ; the mean difference is 1.2 mmHg with SD of 2.1 mmHg.
Study 2 (Validity Test): The same 80 patients are measured once by the new device and once by a trained nurse using a gold-standard manual cuff (within 30 minutes). Device and manual readings correlate at .
Which statement is most accurate?