Help with syringe pressure and Students T test

[madpsychic]

I am a doctor with limited mathematics knowledge. I am trying to prove to my medical fraternity that for a given force of aspiration, a smaller syringe generates a higher "negative pressure". I did a small experiment. I hung an one kilogram weight on a 5 ml and 10 ml syringe and connected it to a Digitron electronic manometer. I got the following neg pressure readings (cm Hg).
The 5 ml syringe: 57.3;55.8;56.7;56.6;55.9;56.6;57.4;56.1;56.1;56.6 The 10 ml syringe gave the following: 32.8;32.3;30.7;31.9;31.9;32.6;30.6;33.3;32.1;30.5
I would like to"scientifically" say that the smaller syringe creates a bigger negative pressure.
Would a "Students t" test be an appropriate one to use ? Can I use MS excel do do the test ?

With regards to the posting by light_bulb: for each reading , i gave a 30 second time period for the readings to settle. Hopefully that will look after the time aspect of things ?

 

[light_bulb]

you'll be using more force in the same amount of time to compensate for filling more volume, so unless your juggling the amount of force or time the larger syringe will create a higher negative pressure.

i'd just put it down like ml / seconds * 0.19336779 = psi a second at 0 degrees c

 

[tacman]

Hello,

As a math tutor, I would be happy to provide some guidance on your experiment and the use of statistical tests to prove your hypothesis.

Firstly, your experiment seems to be well-designed and provides sufficient data to support your claim. However, I would suggest taking multiple readings for each syringe and averaging them to reduce the margin of error. This will also help to account for any external factors that may have affected the readings.

Secondly, in order to determine if there is a significant difference in negative pressure between the two syringes, a statistical test is needed. In this case, the appropriate test to use would be the Student's t-test. This test compares the means of two independent samples and determines if there is a significant difference between them.

To perform the t-test, you will need to input your data into a statistical software program such as MS Excel or use an online calculator. The t-test will provide a p-value, which is the probability of obtaining the observed difference in means if there is no true difference between the two groups. A p-value of less than 0.05 is typically considered statistically significant.

In conclusion, with the data you have collected and the use of the Student's t-test, you can scientifically say that the smaller syringe generates a higher negative pressure. I hope this helps and good luck with your experiment!