Below are blood pressure measurements using traditional blood pressure cuff / stethoscope (#1 / criterion method) and a new portable machine (#2). Enter the data in Microsoft Excel.

Subject Criterion BP (#1) New Machine BP (#2)

1 103 106

2 117 114

3 116 116

4 123 125

5 127 128

6 125 142

7 135 133

8 126 126

9 133 135

10 145 148

11 102 106

12 142 142

13 119 128

14 110 112

15 117 116

1. Describe two ways in which you can evaluate the validity of the new BP machine.

2.Using Microsoft Excel, determine whether or not #2 is a valid measurement of blood pressure (include your calculations on your spreadsheet). Save your Excel file and submit with this assignment (must be in excel format - not a PDF). Explainyour results below.

3. You determine that the standard error of the estimate of the new machine is 4.9 mmHg. Explain what this means. In other words, if you take someone's blood pressure with the new machine and obtain a value of 120 mmHg how confident are you that the measurement is accurate (hint - see chapter 13 or tutorial video).

4.You decide to determine whether or not the #2 method of blood pressure assessment is reliable. You test subjects on a Monday morning and then test them again 15 minutes later. Using a statistical package, you perform an intraclass correlation to determine its reliability and obtain the following reliability coefficient: R =.84. Evaluate your findings below (briefly explain).