BME100 f2014:Group27 L3

BME 100 Fall 2014	Home People Lab Write-Up 1 | Lab Write-Up 2 | Lab Write-Up 3 Lab Write-Up 4 | Lab Write-Up 5 | Lab Write-Up 6 Course Logistics For Instructors Photos Wiki Editing Help
Lab Report 3A: Spree Validation (Group 27) Jonathan Almendras Patrick Conely Krystal Corrette Aaron Dodell Adam Samuel Yakut Umar Results Temperaute Table 1: Averages and Standard Deviations of Temperature for Gold Standard and Spree Headband During Various Activity LevelsBetween Sample Group of 30 Graph 1: Average and Standard Deviation of Temperature for Gold Standard Graph 2: Average and Standard Deviation of Temperature for Spree Headband Heart Rate Table 2: Averages and Standard Deviations of Heart Rate for Gold Standard and Spree Headband During Various Activity LevelsBetween Sample Group of 30 Graph 3: Average and Standard Deviation of Heart Rate for Gold Standard Graph 4: Average and Standard Deviation of Heart Rate for Spree Headband Analysis When comparing the means of the two devices in the context of temperature and heart rate the Spree device seems to yield a larger number. The means calculated for the Gold Standard and the Spree device for temperature were 97.52521 and 103.4094 respectively. Following this trend the means calculated for the Gold Standard and the Spree device for heart rate were 89.45009 and 91.52014 respectively. Unfortunately the standard deviation and standard error did not follow a trend such as the mean. When considering Statistical Evaluation and Analysis T-Test for Temperature Table 3: T-Test for Temperature The T-Test was used because of the two groups, one being the Spree Headband, one being the Gold Standard. From the results of the test, the Pearson's R Correlation Value was -.03863. This value means the correlation between the Headband and Gold Standard is almost zero. This shows there is a significant difference between the headband and the standard. T-Test for Heart Rate Table 4: T-Test for Heart Rate The T-Test was also used because of the same two groups. The results of this test gave a Pearson's R correlation value of .67032. This correlation is positive, but means that there definitely is a quite significant difference between the two groups. Inferential Statistics and Design Flaws with Recommendations The Spree app and headband was fairly well designed, but we found certain flaws especially with the physical design of the headband. Our test subject found that the sensor was too rigid, and after prolonged use hurt his forehead. Especially for use when working out, it should not hinder physical performance or require re-adjustment by the consumer. Additionally, we thought the headband should be made entirely waterproof and heatproof. It appeared to be water-resistant, but if the consumer is sweating profusely, it could possibly cause damage to the sensor. That way, it could also be used if someone wanted to wear it while swimming or if it was accidentally submersed in water. Taking into account the general purpose of the headband (for exercising), we also thought of other concerns that may arise in a gym setting. While walking with our test subject during the experiment, we noticed that we had to go very far from other sensors to be sure that we were picking up our own device. If the developers wanted the Spree app to be a widely used device, it may be a good idea to make it easier to name the devices or create a wireless connection other than Bluetooth. In a packed gym with many people in a close proximity (and all with Spree headbands), this could be a nuisance that may deter consumers from making a purchase. Additionally, the Bluetooth connection wasn’t very reliable; even when our subject was walking with the phone in his hand, it often disconnected (at times, every 3-4 minutes). This would be very inconvenient for someone working out; they may not realize it had disconnected until after they had finished their workout. The connection was especially unreliable if it was more than a foot or so away, which would be inconvenient especially for weightlifters who may have to leave their phone a few feet away. It also may be a good idea to run pressure tests on the headband (if the developers hadn’t done so already). If the headband was temporarily taken off and placed on a gym floor, it would be easy for it to be stepped on or for weights to be dropped on it, potentially ruining the device. Reinforcement precautions could help to prevent this kind of a situation. Our descriptive statistics, graphing, and inferential statistics also gave us invaluable statistical insight into the quality of the Spree headband. We found that