Degrees of freedom Source of Sums of Mean F statistic variation squares squares Regression 81 Error Total

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Multiple Choice Question What is a measure that summarizes how well the sample regression equation fits the data? O Regression O Goodness-of-fit Predictor variables O Dummy variables

Variables Age at which first child was born           AGEKDBRN         Survey question: How old were you when your first child was born?  Respondent’s sex                                  SEX    Respondent’s sex (1 = male or 2 = female)   Descriptive Statistics: Sex n Mean Std. Dev. Min. Q1 Median Q3 Max. IQR male 679 25.5 5.91 12 21 25 29 51 8 female 987 23.4 5.45 13 19 22 27 45 8   Descriptive Statistics: Group Sample Size Mean Std. Dev. female 987 23.44 5.45 male 679 25.55 5.91 Question: Find the 95% confidence interval for the difference between men and women in the mean age at which their first child was born and report the results below. Find the confidence interval for the difference  (mean for men – mean for women). Describe in words what the confidence interval shows about the difference in the mean age at which men and women have their first child.