Significance testing question

If 2 distributions of data have the same mean value but standard deviation of sample 1 is twice the value of sample 2, explain what the difference in standard deviation value would indicate about the two distributions.

Totally stuck with this one.

• Is this homework? if so, it should have the homework tag. And welcome to the site! Mar 14, 2013 at 11:44
• It's a task within a research module. I'm new to this site! Mar 14, 2013 at 11:50
• Think about this as a picture. 2 distributions have the same mean, which is the same as saying they are both centered at the same point on the x-axis. The SD is a measure of how far from the mean, or how spread out the data tends to be. So what would a SD 2X as big as another SD (with same means) say about its distribution? Mar 14, 2013 at 11:59
• Would it say that there is a larger variation of data and that the data is more widely distributed in sample 1 than sample 2? Mar 14, 2013 at 12:02
• Yes, Sample 1 has greater variation than Sample 2. Mar 14, 2013 at 12:18

1 Answer

Not knowing the rest of the questions within your research module, I can point you to the following references for further study: