Boys and girls In 2002 the journal Science reported that a study of women in Finland indicated that having sons shortened the lifespans of mothers by about 34 weeks per son, but that daughters helped to lengthen the mothers lives. The data came from church records from the period 1640 to 1870.

STAT 110: Notes for Week of 10/17/16 Chapter 21 o p = population parameter. o p = sample proportion/percentage. Estimates the parameter. p = (number of successes in the sample/n) o μ = population mean/average. o x = sample mean/average. Estimates the population mean/average. o A statistic (point estimate/p) is unlikely to accurately describe the parameter, while a confidence interval (interval estimate/statistic +/- margin of error) is more likely to include the true parameter. o If the simple random sample is large enough (at least 1,000 participants), then: The proportion of p is approximately normal. The