Can we predict the sex of the first child of a woman?
375110
It's a 50/50 prediction, isn't it?  I know that girls are more likely to be strong and survive at birth, though.  But, maybe since they used to do all that "first son and heir" stuff, there are more sons born first? Who knows.
130631
In most countries, 105 boys are born for every 100 girls. The longer it takes for women to get pregnant, however, the higher the probability of a male birth. \n\nThere are a lot of other factors that influence the probability, some of which you can actually control to change the chances of a male or female birth (see reference).
604629
Hmmmm, I read about that, trying to remember right.  When conception first takes place, the gender is not yet set.  Every baby intially can be male or female, the stem cells then become arms, heart, eyes, everything, including male genitals and prostate OR female genitals, womb and ovaries, and including the ability to grow breasts if the baby becomes a female.  Can't remember when it is that the gender becomes effective, but it's early on.
986369
In hypothesese you would usually try to keep it as far from using personal pronouns as possible so saying,\n'It is predicted that...' is usually a good way to start.\nAlso you can either do a one or two tailed hypothesis.\nExample of 1 tailed, 'It is predicted that people tend to have their first child between ages 23-28'\nExample of 2 tailed, 'It is predicted that people tend to have their first child either at age 24 or age 27'\n\nThe first example is probably better for your work here.\nTo be honest whenever I did coursework like this I did the research first and asked the questions then whatever I found out, I edited my hypothesis to back up my findings.\nJust try to make it fit what you find out and you cant go wrong :)\n\nGood luck on the coursework! x
270363
Have an ultrasound done.  The earliest you can tell the sex of the baby is around the 5th month of pregnancy.
161625
The question is not how deep, but how pregnant?
972008
This is obviously a statistics problem.  Treat each mother as a sample and the data entry the age at which they had their first child.  If all you need is the "mean" point, it is a simple matter of knowing what a "normal distribution" is.  Half of the mothers will be above the mean date and half below (both 50%).  In a "formula" it would be (total of all the ages divided by the number of mothers)  More useful for the analyst is the shape of the distribution - the bell curve and the amount of data in the "tails".  To do this you need to perform a "t test" of the data set.  Since I assume that what you mean is the whole population of women, the distribution can be assumed to be "normal" and the "degrees of freedom" is infinite.  Look up "t test" in your statistics book, also known as "student's t".  The answer is there, in the "degrees of freedom" expressed in "standard deviations" from the mean.  Thus you can talk about "confidence intervals" from this.  The Wikipedia article is surprisingly hopeless for the non-mathematician.  My education is statistics came from "Biostatistical Analysis" by Zar, still in print and one of the only books from my former life I still keep on my shelf.
173177
I have never heard of anything that can change gender (or sex) unless through operation as for human beings. And moreover a frog is from a tadpole hatched from an egg.
665733
What is the gender that this one gender going to reproduce? I need an answer, then only I can answer your question.
731941
Since gender/sex is not dependent upon genetics, there is always a 50/50 chance or 50% probability that the child will be one sex. Use that to narrow down the eye color chances for those questions.
271982
Good point Pazion. But I still say in millions of years we still have seen no physical evidence that this is genetic. There have been no new emergence of a new gender. We are still born male and female. Again, in the next million years we may find that we were wrong in our assumptions. But we will be dead and therefore we still will not care. So it's a lost point even discussing it.
751580
I have the chart with me which was published in a magazine way back in 1980s. These days i haven't come across it. y don't u try the net???? As per the chart, i have noticed that as the girl's age reaches 30 plus the chances of having a girl is more. But im sceptical abt this cos the sex of the child isn't determined by the mother but by the father.
1162535
Nope.  Boys & girls being different in pregnancy is a myth, each pregnancy is different.
540009
it varies from woman to woman
124945
It depends on the technique employed and the species involved.\n\nIf u carry out chromosome analysis, it's from right after fertilization.\n\nFor human, sexual differentiation occours ~6 weeks after fertilization.
1064379
No. remember the sex depends on the sperm so that means that if a sperm carring the girl coding fertilizes the egg then it will be a girl but if one carring the boy coding fertilizes the egg then it will be a boy. \n\nAdded to this is that each sperm carries different coding so besides there being male and female sperm there are differences among them all.
1141760
I say it is wrong.  Each sex has different characteristics and feelings and attributes.  A baby need both a female and a male role model.