The answer is, all three carbons from glucose molecules enters the Kreb cycle. But three at a time only. One molecule is broken down to two pyruvate molecules and then used in Krebs cycle. Which means that one glucose molecules leads to two cycles of the Kreb cycle with three carbons going to the cycle at one time.
The given values are 14,000 sample size and 5% p-value. Statistical significant results are achieved when p-value is less than the significance level. This shows a 95% confidence of results in the samples. The rejection region is composed of 5% of the sample distribution.
