Problem

When measuring various physiological responses, the most common problem is, arguably, noise from other biological systems which you are not intending to measure. This means a great deal of biomedical applications will require you to take a large amount of data obtained from some device, and remove unwanted noise in order to correctly interpret the results. In addition to this, you are required to take the newly filtered data. Then, you must transform it into something the medical professional will be able to understand.

For this problem, a device measuring blood pressure is suspected of providing outputs which are not useful. You will need to see if the output is useful or not. If it is not useful, you will need to fix it (SPOILER ALERT: You will need to fix it). The data provided to you is a range of blood pressure values, in mmHg.

1. Import the data from the .txt file provided (MachineData.txt) and plot the data vs. the time over which it was measured. The measurement was taken over a period of 2.27 seconds. Include appropriate labels on the plot.

2. Obviously, this data is useless, now you'll need to fix it. The only range of values we are interested in are the data points between 50 and 250 mmHg. Find any values outside this range, remove them, and plot the data again. Be sure to include appropriate labels.

3. You should have gotten a fairly nice looking plot of blood pressure levels over a series of heartbeats. If not, you did something wrong.

4. Finally, the hospital would like to have the fixed values for their records. Please write them to an Excel file. Name the file 'Corrected Blood Pressure Data' and include a column title of the same name in the Excel file.