Question

# More and more companies in Halifax are trying to enter the lucrative health care products area....

More and more companies in Halifax are trying to enter the lucrative health care products area. Sunray makes a variety of health care appliances for use in the home. One product is a digital blood pressure gauge that can be operated by a patient at home without the aid of a health care professional. Obviously, accuracy of the gauges is important to home users. However, many complaints have been received regarding the accuracy of these gauges. The Canadian Medical Association has jurisdiction over use in Canada of medical devices such as these gauges. Early investigation by a team of association doctors convinced them that the gauges are not functioning accurately. To be fair to the manufacturers of the gauge, the president of the association has decided to conduct a study testing the accuracy of these gauges. Following the typical procedure for testing gauges, the association has selected a group of 15 patients, typical of home users in general. The home users in this study were asked to have their (systolic) blood pressure taken first by an accredited physician (who is assumed to provide accurate readings of systolic pressure) and then, as soon as they got home, by the patients themselves using the Sunray home gauge. The data for the 15 patients tested appears in the table below:

 Patient Physician Gauge A 112 126 B 109 108 C 139 116 D 141 123 E 120 138 F 99 123 G 128 119 H 118 122 I 116 116 J 120 118 K 111 114 L 123 108 M 114 130 N 121 123 O 132 127

Do average systolic readings made by patient users of the gauge differ significantly from those taken by physicians? Use a 95% confidence interval (CI) to answer this question. Answer this question using either hand calculations or Excel. If you use an Excel analysis to answer this question, attach the printout of the output to your assignment.

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