please help me I am stuggling doing my data analysis of my poject and my supevisor is on holiday but I have to finish all the ananlysis in two week time.

I am looking for which test is more suitable to test my hypothesis. .I have one group and the comarison is between samples in this goup, what i want to confirm is that the variation of results between my samples is differ significantly. For example, I have 30 samples and I measured the number of cells in each sample and there was huge differences between them, some have vey high number and some have very low. So, I want to pove that this difference between the samples is significant. All the tests used are comparing two sets of data, and even for one goup test is comparing befoe and after or compare the mean of sample with previously mensioned mean but I only have one goup of data with one measuement.

The only way I can think of is to calculate the mean and then compare the data with it and see if the spread is significant using one sample t-test? is that true? if not So which test is more suitable?

Please help if you have any info