# Scientific Hypothesis, Theory, Law Definitions - …

In conclusion, we found that in arrested L1 worms whose parents were grown on plates purine metabolism stops at uric acid, while in arrested L1s whose parents were grown in liquid culture it proceeds one step further and uric acid is converted to allantoin. At present, we do not have a satisfactory explanation for this effect. Finally, we found that there was no significant difference in L1 starvation survival between these two groups of worms.

## Hypothesis Test: Difference in Means

### Hypothesis vs Hoctaw - What's the difference? | WikiDiff

So, you might get a *p*-value such as 0.03 (i.e., *p* = .03). This means that there is a 3% chance of finding a difference as large as (or larger than) the one in your study given that the null hypothesis is true. However, you want to know whether this is "statistically significant". Typically, if there was a 5% or less chance (5 times in 100 or less) that the difference in the mean exam performance between the two teaching methods (or whatever statistic you are using) is as different as observed given the null hypothesis is true, you would reject the null hypothesis and accept the alternative hypothesis. Alternately, if the chance was greater than 5% (5 times in 100 or more), you would fail to reject the null hypothesis and would not accept the alternative hypothesis. As such, in this example where *p* = .03, we would reject the null hypothesis and accept the alternative hypothesis. We reject it because at a significance level of 0.03 (i.e., less than a 5% chance), the result we obtained could happen too frequently for us to be confident that it was the two teaching methods that had an effect on exam performance.

### Difference between Hypothesis and Prediction

If our statistical analysis shows that the significance level is below the cut-off value we have set (e.g., either 0.05 or 0.01), we reject the null hypothesis and accept the alternative hypothesis. Alternatively, if the significance level is above the cut-off value, we fail to reject the null hypothesis and cannot accept the alternative hypothesis. You should note that you cannot accept the null hypothesis, but only find evidence against it.