BME100 f2014:Group3 L3

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Name: Marissa Seelhammer
Name: Brianna Denuit
Name: Farhad Eghbalian
Name: Shane Mitchell
Name: Catherine Piatak
Name: Nivenka Mahesh


Descriptive Statistics

Mean for Temperature and Heart Rate

Gold Standard Temperature: 97.53

Spree Temperature:103.41

Gold Standard Heart rate: 91.68

Spree Heart Rate: 92.823

Standard Deviation

Gold Standard Temperature: .8627

Spree Temperature: 3.007

Gold Standard Heart Rate: 21.09

Spree Heart Rate: 21.485

Standard Error

Gold Standard Temperature:

Spree Temperature:

Gold Standard Heart Rate:

Spree Heart Rate:


Gold Standard Temperature:

  Spread: 94.2-99.4
  Range: 5.2
  Variance: 0.744

Spree Temperature:

  Spread: 97-110
  Range: 13
  Variance: 9.042

Gold Standard Heart Rate:

  Spread: 42-188
  Range:  146
  Variance: 444.788

Spree Heart Rate:

  Spread: 44-179
  Range: 135
  Variance: 461.605


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The spree only had 4 numbers (1-4), and a normal oral thermometer has many number. The scale for the spree was level 1 is 97 degrees, level 2 is 103 degrees, level 3 is 110 degrees, and level 4 is 116 degrees.

Temperature: T-test: 1.01X10^-14 Pearsons R: -.0887137

Heart rate: T-test: .000196251 Pearson's R: .89

Appropriate Rational: Because the p-value is so small(p-val<.05) our results are statistically significant. So we are confident that the spree and the gold standard do not give the same values.

Proper Implementation of the Test: We used a t-test because two data sets were being compared. An anova test is used when more than two data sets are being analyzed.

Correct Conclusions From The Test: There is a strong positive correlation for the heart rate devices, but no correlation for the two temperature devices.

Errors and observations recorded during the trails are as follows:

The subject that had the headband on consumed caffeine in the middle of the trials, which left room for error. Also, the subject had ice in her mouth. This made the reading of temperature by mouth colder than the actual value of her core body temperature.

Also, the devices that were used to measure heart rate interfered with each other. When the sphygmomanometer added pressure to the subject’s wrist, the blood pressure measurement that was recorded on the spree app would increase.

Lastly, the amount of trials and subject that were used to interpret data added many recorded numbers that did not make sense. Due to the fact that not all of the recorded numbers were our group’s direct data, we were not able to change the data. These outliers caused for error in our experimental analysis.


Flaws: The Spree headband records temperature by levels rather than by an exact number. The headband records four different levels that indicate a range on temperature from the user. For instance, level one indicates a temperature of 97, level two indicates a temperature of 103, level three indicates a temperature of 110, and level four indicates a temperature of 116. The spree does not provide an accurate or exact reading of temperature.

The placement of the spree headband can also leave room for error depending on the levels of sweat that the particular place of the freehand contains. Core temperature and skin temperature vary dramatically based off the sweat levels and pigment of the skin. For instance, if the weather outside in extremely cold or extremely hot, the device would record a temperature measurement that is colder or hotter than the actual core body temperature of the user. Overall, temperature based off of touch of skin is not an accurate measurement.

Recommendations: The main recommendation for the Spree headband is to have the device not record temperature by a scale but rather to an exact number. This is achievable by adding a microprocessor that can interpret the scale data that the headband already records.


Target Population and Need

Walkie Talkies are targeted towards people of all ages who desire to meet certain fitness goals, such as gaining or losing weight, or simply want to track their activity and stay motivated to make healthy choices. Walkie Talkies constantly track the user's weight, GPS location, and activity level, but the feature that makes them truly unique is their periodic vocal reminders to stay on track.This feature means that Walkie Talkies will be especially effective for those who have tried other fitness monitors before but still lacked the motivation to follow through with their health goals. Because Walkie Talkies monitor weight directly instead of users manually entering their weight like with most other fitness trackers, users cannot lie about their progress. Additionally, Walkie Talkies' GPS location monitoring ensures that user's will be warned not to stop in at the McDonald's they are currently walking past for lunch, making healthy choices much simpler.

Device Design

Inferential Statistics



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