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visits member for 1 year, 11 months
seen Sep 13 '13 at 23:49

Sep
30
answered Craps game probability
Sep
30
asked How do we identify a probability problem as a conditional probability problem?
Sep
24
comment Solving an equation with three quadratic radicals in the set of real numbers
2 seems to work...
Sep
24
comment Probability in flipping a coin
@did the answer is accepted, when i unaccepted the answer, I added questions in the comment beneath the answer, and Jean provided answers to my questions, so i reaccepted his answer.
Sep
23
comment Confusion on the meaning of confidence interval
it seems quite reasonable that they would "cancel" out because sometime we'd get a sample mean higher than the true mean sometimes lower, but is there a formal explanation as to how they cancel(usually should be some proof or explanation) for this, if not "convenient", cancellation.
Sep
22
revised Confusion on the meaning of confidence interval
edited title
Sep
22
comment Confusion on the meaning of confidence interval
i see, you want to be precise. but can you explain why is the area under the curve to the left of 72.1 is less than the area under the curve to the right of 72.1 in the graph above?
Sep
22
revised Confusion on the meaning of confidence interval
added 2 characters in body
Sep
22
comment Confusion on the meaning of confidence interval
but why is the area under the curve to the left of 72.1 less than the area under the curve to the right of 72.1 in the graph above?
Sep
22
comment Confusion on the meaning of confidence interval
we should be able to assume the distribution is normal because of Central Limit Theorem, and in this case $n$ >30
Sep
22
revised Confusion on the meaning of confidence interval
edited body
Sep
22
revised Confusion on the meaning of confidence interval
edited title
Sep
22
revised Confusion on the meaning of confidence interval
edited title
Sep
22
asked Confusion on the meaning of confidence interval
Sep
22
revised General Addition Rule for Probability extended to 4 events?
deleted 2 characters in body
Sep
22
answered General Addition Rule for Probability extended to 4 events?
Sep
22
accepted Probability in flipping a coin
Sep
22
comment Probability in flipping a coin
shouldn't the answer be $1-p-p^2-p^3-p^4$ because $1-p^4$ only excluded the possibility that all of the first 4 flips are H, we can also have HTHHH, HHTHHH, HHHTHHH, therefore those probabilities need to be subtracted as well.
Sep
22
comment Probability in flipping a coin
ok yes, you're correct. ill think about it a little bit more
Sep
22
comment Probability in flipping a coin
your answer is very insightful, but after reading them, I tend to side with the answer $1-p$ simply because we can have any gibberish after the first flip, for example, THTHTHTTH, if we want to form HHHH, we must have HHH, and because we have ensured that the first roll is not an H, we will eventually have THHH, in my suggested gibberish example, it would turn out to be THTHTHTTHHH, there we have THHH before HHHH. So $1-p$ excludes the possibility that on the first flip, we have a H, there's the answer we're looking for.