Are Chicken based dishes more populat than Pizza to a level which is statistically significant at the 95% confidence level.
I can upload my spreadsheet with all the figures.... I dont have a clue which ones to use to work it out. Can somebody explain please?
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- Thread Starter
Last edited by laurie93; 25-03-2013 at 10:28. Reason: level
- 25-03-2013 10:19
- 25-03-2013 11:28
If you can figure out the standard deviation (positive square root of the variance) and you know the mean, then you also know, according to the empirical rule, that the 65% confidence level lies within 1 standard deviation below the mean, and 1 above the mean. You also know that 95% of it lies within 2 standard deviations below the mean, and 2 above. 99.7% lies within 3 standard deviations below, and 3 standard deviations above.
So assuming you have drawn out your bell shaped normal distribution, locate the area within 2 standard deviations of your mean. The value of your 2 standard deviations below, and 2 above, will make an interval say [x, y]. At this point you can assume that we are 95% confident that your scores lie within the [x, y] interval.
Hope that helps
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