I'm new to stats as you will probably become aware.

Just need a little help to understand which statistical method should be

used to test a hypothesis.

The work centres around a surgical endoscopy procedure for the taking of biopsy samples. The hypothesis states that with an increase in the number of procedures carried out there should be a lowering in the time the procedure takes and the number of attempts to take a clean biopsy.

!2 procedures have been observed and the data collected as follows.

Procedure Time Taken Attempts

1 90min 3

2 80min 2

3 90min 3

4 60min 2

5 60min 2

6 60min 2

7 90min 3

8 60min 2

9 60min 3

10 60min 4

11 30min 2

12 20min 2

Mean 63.3 2.5

Mode 60 2

Median 60 2

S.Deviation 19.79 0.622

Any advice on the method I should use to prove/disprove the hypothesis would be appreciated.

I was suggested to use a chi-square calculation which I did and got the following: Df=11 Chi-square=4.3140201607494 with the significance level at .05, chi-square should be 19.68 and therefore the distribution is not significant. p <= 1.

I don't know if this was the right test or if it is the start of another but any help would be appreciated.

Kind regards

Andrew