1. A linear regression predicting age at first childbirth by sibling count, birth year, year of the survey, years of father's education, respondent sex, whether the respondent was born outside the US, whether the respondent lived with both their parents at 16, and religious fundamentalism. Use one multivariate model.

Regression Statistics
Multiple R	0.385117812
R Square	0.148315729
Adjusted R Square	0.147832398
Standard Error	5.332338974
Observations	15869
ANOVA
	df	SS	MS	F	Significance F
Regression	9	78527.16	8725.24	306.8611264	0
Residual	15859	450932.3	28.43384
Total	15868	529459.4
	Coefficients	Standard Error	t Stat	P-value	Lower 95%	Upper 95%	Lower 95.0%	Upper 95.0%
Intercept	23.56670193	0.256696	91.80785	0	23.06355	24.06986	23.06355	24.06986
4	-0.204373929	0.015381	-13.2874	4.48818E-40	-0.23452	-0.17423	-0.23452	-0.17423
52	-0.024519117	0.002874	-8.53109	1.5792E-17	-0.03015	-0.01889	-0.03015	-0.01889
0	0.057575406	0.006091	9.453107	3.73911E-21	0.045637	0.069514	0.045637	0.069514
9	0.277854721	0.011256	24.6843	4.8361E-132	0.255791	0.299918	0.255791	0.299918
1	-2.354956072	0.085841	-27.434	6.3441E-162	-2.52321	-2.1867	-2.52321	-2.1867
1	1.458598048	0.142043	10.2687	1.16479E-24	1.180178	1.737019	1.180178	1.737019
1	1.577904256	0.118874	13.27375	5.37251E-40	1.344898	1.810911	1.344898	1.810911
0	-1.488770499	0.118373	-12.5769	4.20561E-36	-1.7208	-1.25675	-1.7208	-1.25675
1	-0.186701508	0.108493	-1.72087	0.085294314	-0.39936	0.025956	-0.39936	0.025956