Under the usual convention of 95% significance, it's neither :-D
> binom.test(508634, 1000000, 0.51)
Exact binomial test
data: 508634 and 1e+06
number of successes = 508634, number of trials = 1e+06, p-value = 0.006304
alternative hypothesis: true probability of success is not equal to 0.51
95 percent confidence interval:
0.5077 0.5096
sample estimates:
probability of success
0.5086
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.