You are here (click or tap to change) Back to Chapter 9 Main Page
Graphing Calculator Example
9.5 t-Interval to Compare Two Population Means: Independent Samples (Unequal Variances)
Who recovers from childbirth faster? A randomly selected sample of 16 insured women spent an average of 2.4 days in the hospital for a routine childbirth with a standard deviation of 0.62 days. Another randomly selected sample of 16 uninsured women spent an average of 1.8 days in the hospital for a routine childbirth with a standard deviation of 0.53 days. Find the 98% confidence interval for the true mean difference between the amount of time spent in the hospital after childbirth for insured women verses uninsured women (Do not assume equal variances). Is there a significant difference?
Ask the Professor