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# Statistics Help for a retard! Watch

1. 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?
Attached Files
2. Stats.xlsx (11.6 KB, 49 views)
3. 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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Updated: March 25, 2013
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