I am currently doing a lab experiment on viscosity. Basically placing a glass ba

Question

I am currently doing a lab experiment on viscosity. Basically placing a glass ball inside a tube full of sugra solotuin., and recording the times for the ball to travel a distance of 100mm. My issue is for such a small data set i.e 3 trials how do I calulate the unceratinty associted with the average, as I need to plot the reults on a graph and this uncertainty will be my error bars.

So sample of my first set of data is as follows

Is there a possiblity somoen could explain the best cours3e of action to take here please.

Explanation / Answer

Many statisticians say that a sample size of 30 is adequate sample size. If you know something about the shape of the sample distribution, you can refine that rule. The sample size is large enough if any of the following conditions apply.

Statistics work on both small and large sample sizes. For instance, t-test and z-test work in a similar way but the only difference is when the sample size < 30 we use t-test and Z-test otherwise. Now, according to me the sample size of greater than equal to five is quite enough for the analysis purposes, but advanced statistics cannot be utilized with this approach.

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